Flabby midriff, idiomatically (5,4)

I believe the answer is:

spare tyre

(Other definitions for spare tyre that I've seen before include "Part of corporation" , "Roll of fat around the waist, like car part" , "sign of over-indulgence?" , "what motorist carries" , "Fat around the midriff?" .)

I've seen this clue in the Sydney Morning Herald.

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