Filed from 2 published puzzles

CLAMMED

Set once, to “Shut (up)” — The New York Times, Sunday, 25 June 2006.

7 letters

Other answers to these clues

BUTTONYOURLIP13 letters
CANIT5 letters
CANNEDIT8 letters
CLAM4 letters
CLOSETED8 letters
COOP4 letters
GAG3 letters
PENT4 letters
SEAL4 letters
SEALED6 letters
SILENCE7 letters
ZIPIT5 letters