Money I get in a trick (4)
I believe the answer is:
coin
'money' is the definition.
(coin is a type of money)
'i get in a trick' is the wordplay.
'get in' is an insertion indicator.
'a trick' becomes 'con' (a con is a fraud or trick).
'i' placed inside 'con' is 'COIN'.
(Other definitions for coin that I've seen before include "Metal used as money" , "Create (phrase); metal token" , "little money" , "Make up" , "Invent a word or phrase - for money?" .)