Last word after cricket match, requirement finally for proof (9)
I believe the answer is:
testament
'proof' is the definition.
(thesaurus)
'last word after cricket match requirement finally' is the wordplay.
'last word' becomes 'amen' (I've seen this before).
'after' means one lot of letters go next to another.
'cricket match' becomes 'test' (a test is a kind of cricket match).
'finally' suggests the final letters.
The last letter of 'requirement' is 't'.
'amen' after 'test' is 'testamen'.
'testamen'+'t'='TESTAMENT'
'for' acts as a link.
(Other definitions for testament that I've seen before include "Will or solemn declaration" , "Will - covenant" , "it could be old or new" , "Proof" , "Tribute" .)