Conservative with a quiet home to make money (4,2)
I believe the answer is:
cash in
'make money' is the definition.
(I've seen this before)
'conservative with a quiet home' is the wordplay.
'conservative' becomes 'C' (abbreviation commonly used in UK politics).
'with' means one lot of letters go next to another.
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'home' becomes 'in' ('he's home' can mean 'he's in').
'c'+'a'+'sh'+'in'='CASH IN'
'to' acts as a link.
(Other definitions for cash in that I've seen before include "Realise" , "Make money" , "Exchange for money; seize an advantage" , "Get ready" , "Take advantage of" .)