She has her way of working against Mr Gershwin (5)
I believe the answer is:
moira
'she' is the definition.
'her way of working against mr gershwin' is the wordplay.
I cannot really see how this works, but
'her' could be 'ira' and 'ira' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
A single letter 'm' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'has' acts as a link.
Can you help me to learn more?
(Other definitions for moira that I've seen before include "-- Shearer, ballet dancer" , "Shearer, possibly" , "Shearer perhaps" , "Any of the three Greek Fates" , "Girl" .)