In such a style as to lash out generously for a girl (6)
I believe the answer is:
lavish
'in' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I can't see?
'a style as to lash out generously for a girl' is the wordplay.
I cannot really see how this works, but
'a' is within the answer.
'girl' could be 'vi' (short for Violet) and 'vi' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'such' is the link.
Can you help me to learn more?
(Other definitions for lavish that I've seen before include "Extremely generous" , "Unstinting" , "Plentiful, generous" , "Heap (money)" , "Sumptuously rich" .)