Usually a leg spinner's angry when powerless to dismiss Stokes at first (2,7)
I believe the answer is:
in general
'usually' is the definition.
(I've seen this in another clue)
'a leg spinner's angry when powerless to dismiss stokes at first' is the wordplay.
I cannot really see how this works, but
'a' is found in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
'at' could be 'in' (synonymous in some cases - eg at school, in school) and 'in' is found within the answer.
This explanation may well be incorrect...
(Other definitions for in general that I've seen before include "Overall" , "Commonly" , "More-or-less" , "by and large" , "Not particularly" .)