To shoot an old hen is not something to be proud of (9)
I believe the answer is:
potboiler
'not something to be proud of' is the definition.
I can't tell whether this defines the answer.
'to shoot an old hen' is the wordplay.
'to shoot' becomes 'pot' (I've seen this in other clues).
'an old hen' becomes 'boiler' (I can't explain this - if you can you should believe this answer much more).
'pot'+'boiler'='POTBOILER'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for potboiler that I've seen before include "Work of literature produced just to make money" , "Piece of writing done merely to make money, of no artistic value" , "hasty work" , "Quickly written novel of little merit" , "Money-making book" .)