Stomach certain sporting blokes required? (5)
I believe the answer is:
rumen
'stomach' is the definition.
(I've seen this before)
'sporting blokes required?' is the wordplay.
'sporting' becomes 'ru' (I can't justify this - if you can you should believe this answer much more).
'blokes' becomes 'men' (I've seen this in other clues).
'required?' says to put letters next to each other.
'ru'+'men'='RUMEN'
'certain' acts as a link.
This may not be right. It may belong to another bit of the clue.
(Other definitions for rumen that I've seen before include "First stomach of a cow - run me (anag)" , "Place to digest" , "bit of guts (beastly type)" , "This organ" , "Cow's first stomach" .)