A blow round a bulging midriff (6)
I believe the answer is:
'midriff' is the definition.
'a blow round a bulging' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'blow' could be 'punch' (punch is a kind of blow) and 'punch' is found within the leftover letters.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for paunch that I've seen before include "Large stomach or belly" , "Gut" , "Protuberant stomach" , "corporation" , "Fat belly" .)