Kitty gets kettle as a source of income (9)
I believe the answer is:
potboiler
'a source of income' is the definition.
I can't tell whether this defines the answer.
'kitty gets kettle' is the wordplay.
'kitty' becomes 'pot' (both can mean a shared fund).
'gets' means one lot of letters go next to another.
'kettle' becomes 'boiler' (synonyms).
'pot'+'boiler'='POTBOILER'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for potboiler that I've seen before include "work to deliver bread fast" , "Book of little merit designed to make a quick profit" , "Literary work of poor quality" , "Book written just for the money" , "Book of little merit written to make a quick profit" .)