Across

• 1Of Siam, once — or a Southeast Asian language
• 5What the schooner sails — or a vast expanse
• 8In the middle of — or surrounded by
• 12Smallest of the litter — or an undersized cowpoke
• 13Wire message, briefly — or communication abbr.
• 14Cut with a laser, as for surgery or engraving
• 15Troy's land, poetically — or a hospital wing, briefly
• 16Boxer Clay, once — or a boxing legend's first name
• 17Poet's inspiration — or a museum's charge
• 18Printer's tray of set type — or a kitchen shipboard
• 20Wedges that lock type in the chase
• 22Policy add-ons, briefly — or inserts in a policy
• 23Universal Time coords, briefly — or baseball outs
• 24Official decree — or a thundered order from the editor's desk
• 27Molten-lead composition, as opposed to cold type
• 31Spring month, in Paris
• 32Put pen to copy — or composed, as a letter
• 34Grab a bite — or corrode, as acid does
• 35One full press run of the paper
• 37Spread where the cattle graze
• 39Santa ___ winds — or a crossword constructor's first name
• 40Under the weather — or poorly printed, slangily
• 41Stereotypes the press rolls from — or dishes
• 44Press ___ (turns of the cylinder)
• 48Oxidation on the iron — or a frontier town's quiet plague
• 49As well — or overly
• 51Whit — or a Greek letter's jot
• 52World's fair, briefly — or a big exhibition
• 53Sea eagle — or a newspaperbird, old slang
• 54Fairbanks, to pals — or a common first name
• 55Money south of the border
• 56___ Kapital — or German article
• 57Hits the slopes — or slides over snow

Down

• 1Surveyor's sighting mark — or a trigonometry abbr.
• 2Island dance — or a skirt of that name
• 3Indigo dye plant — or a deep blue
• 4Slanted type — or Mediterranean, as a cuisine
• 5Remains — or doesn't leave the hotel
• 6Snakelike swimmer — or a wriggler in the creek
• 7Exact divisor, in chemistry or math
• 8Nearly — or just shy of entirely
• 9Hawaii's Valley Isle — or a Pacific getaway
• 10Serials' catalog code, briefly
• 11River mouths' opposite, briefly — or high-school grades
• 19Twist together, as vines — or plot lines
• 21Completely — or beyond all doubt
• 24Japanese mother, honorifically
• 25Pop, to a tot
• 26Third in a series, in Roman numerals
• 27Sweetheart, slangily — or a Japanese honorific
• 28Tokyo cash
• 29Political action committee, briefly
• 30Old English letter shaped like a crossed d
• 33Cooked over an open fire — or warmly praised
• 36Ink under the skin
• 38Auk family members — or diving seabirds
• 40Desktop symbols — or sacred images
• 41Cook's mise en place — or a student cram session
• 42High-end, in ads — or sumptuous
• 43Venomous snakes — or vipers of the desert
• 45Peer — or appear to be
• 46Ornate needle case — or a sewing-kit trinket
• 47Droops — or loses stiffening
• 50Mouth, anatomically — or an edge, in Latin