Christian in favour of cricket match with worker (10)
I believe the answer is:
protestant
'christian' is the definition.
(I know that Protestant is a type of christian)
'in favour of cricket match with worker' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'cricket match' becomes 'test' (a test is a kind of cricket match).
'with' says to put letters next to each other.
'worker' becomes 'ant' (worker is a type of ant).
'pro'+'test'+'ant'='PROTESTANT'
(Other definitions for protestant that I've seen before include "Lutheran, perhaps" , "expressing dissent" , "Opposing" , "Follower of Luther" , "A Christian" .)