Deal with as an act of generosity (5)
I believe the answer is:
treat
'deal with' is the definition.
(synonyms)
'an act of generosity' is the wordplay.
I cannot quite understand how this works, but
'an' could be 'a' and 'a' is located in the answer.
The remaining letters 'tret' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'as' acts as a link.
Can you help me to learn more?
(Other definitions for treat that I've seen before include "Enjoyable surprise gift" , "Try to heal" , "Cure" , "Stand a drink" , "Care for medically" .)