Outcry as Oxford player crows (4,6)
I believe the answer is:
blue murder
'outcry' is the definition.
(I have seen 'Horrible outcry' mean 'blue murder' so perhaps 'outcry' could also mean 'blue murder')
'oxford player crows' is the wordplay.
'oxford player' becomes 'blue' (term for someone representing Oxford at sports).
'crows' becomes 'murder' (I've seen this before).
'blue'+'murder'='BLUE MURDER'
'as' acts as a link.
(Other definitions for blue murder that I've seen before include "Great outcry - horrible din" , "Terrible commotion?" , "racket" .)