Such a rascal can’t be a good bowler (3,3)
I believe the answer is:
'such a rascal can't' is the definition.
I can't judge whether this defines the answer.
'a good bowler' is the wordplay.
'a good' becomes 'bad' (I can't explain this - if you can you should believe this answer much more).
'bowler' becomes 'hat' (I've seen this in other clues).
'be' is the link.
Can you help me to learn more?