Person leaving cricket match at Oval before end of over (8)
I believe the answer is:
testator
'person' is the definition.
(testator is a kind of person)
'cricket match at oval before end of over' is the wordplay.
'cricket match' becomes 'test' (a test is a kind of cricket match).
'oval' becomes 'o'.
'before' is a charade indicator (letters next to each other).
'end of' suggests the final letters.
The final letter of 'over' is 'r'.
'test'+'at'+'o'+'r'='TESTATOR'
'leaving' acts as a link.
(Other definitions for testator that I've seen before include "One who makes a will" , "Will compiler" , "One who has made will" , "Will provider" , "Will signatory" .)