Crossword Genius

Extended coverage of the 'beer belly' situation (7)

Ross

I believe the answer is:

overlap

'extended coverage' is the definition.
(something which overlaps)

I don't understand how the rest of the clue works.

(Other definitions for overlap that I've seen before include "Common area of interest" , "Partially cover" , "Put extra cover on" , "Extend on top of" , "Partly cover - a plover (anag)" .)

I've seen this clue in The Guardian.
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