Some money trick taking one in (4)
I believe the answer is:
coin
'some money' is the definition.
(coin is a type of money)
'trick taking one in' is the wordplay.
'trick' becomes 'con' (a con is a fraud or trick).
'taking one' becomes 'i' (Roman numeral. I am not sure about the 'taking' bit.).
'in' is an insertion indicator.
'con' placed around 'i' is 'COIN'.
Can you help me to learn more?
(Other definitions for coin that I've seen before include "American quarter, for example" , "Money; devise (a word)" , "Create (phrase); metal token" , "Penny, say?" , "Metal currency" .)