Crossword Genius

Almost puncture close to kerb. Spare tyre? (4)

Ross

I believe the answer is:

flab

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'spare tyre?' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

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(Other definitions for flab that I've seen before include "Ugly, surplus flesh" , "Fat acquired by over-eating" , "Loose flesh; fat" , "Soft loose flesh" , "Sign of overeating" .)

I've seen this clue in The Sunday Times and The Times.
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