Champion bridge team to ruminate? (4)
I believe the answer is:
chew
'to ruminate?' is the definition.
(I've seen this in another clue)
'champion bridge team' is the wordplay.
'champion' becomes 'ch' (sporting abbreviation).
'bridge team' becomes 'EW' (bridge players are North, East, South, West).
'ch'+'ew'='CHEW'
(Other definitions for chew that I've seen before include "Ruminate" , "champ" , "Process food" , "work with canines" , "Try to eat" .)