For a commentator, indeed batsman is a revelation (3-6)
I believe the answer is:
eye-opener
'a revelation' is the definition.
(I have seen 'unexpected revelation' mean 'eye opener' so perhaps 'revelation' could also mean 'eye opener')
'for a commentator indeed batsman' is the wordplay.
I cannot quite understand how this works, but
'batsman' could be 'opener' (I've seen this before) and 'opener' is found in the answer.
The remaining letters 'eye' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for eye-opener that I've seen before include "Startling revelation" , "Fact that brings great surprise - wakes you up" , "Fact or circumstance that brings enlightenment and surprise" , "Fact that surprises or enlightens in optical way" , "Surprise revelation" .)