Extremely hard for ten playing cricket (3-3)
I believe the answer is:
all-out
'extremely' is the definition.
(thesaurus)
'hard for ten playing cricket' is the wordplay.
I cannot quite see how this works, but
'ten' could be 'lo' (resembles 10) and 'lo' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for all-out that I've seen before include "Complete" , "Whole-hearted (effort)" , "Nobody home, or using every possible speed" , "At full speed - no one at home" , "Exerting maximum effort - nobody home" .)