Crossword Genius

Useful in case of flat or round belly (5,4)

Ross

I believe the answer is:

spare tyre

I believe this clue is a double definition.

'useful in case of flat' is the first definition.
(a spare tyre is useful if you get a flat tyre)

'round belly' is the second definition.
(spare tyre can mean belly fat)

'or' acts as a link.

(Other definitions for spare tyre that I've seen before include "Gastric band" , "The fifth wheel?" , "Form of extra weight" , "Love handles" , "large corporation" .)

I've seen this clue in The Guardian.
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