A crack in the ceiling again (3)

I believe the answer is:

gag

'a crack' is the definition.
(I've seen this in other clues)

'in the ceiling again' is the wordplay.
'in' indicates a hidden word.
'GAG' is hidden in the letters of 'ceiling again'.

(Other definitions for gag that I've seen before include "Muzzle or silence" , "Humorous anecdote or remark" , "A palindromic joke or muzzle" , "Put a muzzle on the joke" , "Make quiet" .)

I've seen this clue in the Evening Standard.

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