Cricket side into beer to declare (6)
I believe the answer is:
allege
'declare' is the definition.
(I've seen this in another clue)
'cricket side into beer' is the wordplay.
'cricket side' becomes 'leg' (I've seen this before).
'into' means one lot of letters goes inside another.
'beer' becomes 'ale' (type of beer).
'leg' put into 'ale' is 'ALLEGE'.
'to' acts as a link.
(Other definitions for allege that I've seen before include "Declare without actual proof" , "State as a fact without proof" , "Cite in discussion" , "hold" , "Declare without absolute proof" .)