Confirm you might find cricket lover here? (6)
I believe the answer is:
attest
'confirm' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
(Other definitions for attest that I've seen before include "Provide firm evidence" , "Make evident" , "Certify or bear witness" , "Affirm by oath" , "say, in court" .)