There’s only so much a bowler can take? (6)
I believe the answer is:
hatful
'there's only so much a' is the definition.
I can't tell whether this definition defines the answer.
'bowler can take?' is the wordplay.
'bowler' becomes 'hat' (bowler is a type of hat).
'can take?' becomes 'ful' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hat'+'ful'='HATFUL'
Can you help me to learn more?
(Other definitions for hatful that I've seen before include "lot" , "Large number" .)