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