13 across
Tongue-in-cheek,
creep
inside
(4)
Tongue-in-cheek, creep inside (4)
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The definition is at the end of the clue.
How the clue works
The definition is creep, meaning to move slowly or edge along, just as to inch is to creep forward. The answer is hidden inside the phrase "Tongue-in-cheek" — tongue-IN-CHeek — with "inside" as the hidden-word indicator.