Paunch of some games players (5)
I believe the answer is:
rumen
'paunch' is the definition.
(thesaurus)
'some games players' is the wordplay.
'some games' becomes 'ru' (I can't justify this - if you can you should give a lot more credence to this answer).
'players' becomes 'men' (eg men referring to the players in a football team).
'ru'+'men'='RUMEN'
'of' is the link.
Can you help me to learn more?
(Other definitions for rumen that I've seen before include "This organ" , "bit of guts (beastly type)" , "Cow's first stomach" , "Place to digest" , "First stomach of a cow - run me (anag)" .)