Politicians do, after generous start (7,5)
I believe the answer is:
liberal party
'start' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'politicians do after generous' is the wordplay.
I cannot quite see how this works, but
'do' could be 'party' (I've seen this in another clue) and 'party' is found within the answer.
'generous' could be 'liberal' (similar in meaning) and 'liberal' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for liberal party that I've seen before include "Governors once" , "orgy?" , "Political grouping" .)