Comfy as an insect in a carpet? (4)

I believe the answer is:

snug

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'comfy' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for snug that I've seen before include "Close fitting but comfortable" , "Warm and cosy" , "Small bar in pub - warm and comfortable" , "Bar parlour - comfortably placed" , "Comfortable -- small secluded room" .)

I've seen this clue in The Guardian.

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