Sort of larceny associated with cash (5)
I believe the answer is:
petty
'sort of larceny' is the definition.
'associated with cash' is the wordplay.
'associated' becomes 'etty' (I can't explain this - if you can you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'cash' becomes 'p' (abbreviation for pence).
'etty' after 'p' is 'PETTY'.
Can you help me to learn more?
(Other definitions for petty that I've seen before include "Unimportant" , "Insignificant or trivial" , "Insignificant and smallminded" , "Trifling" , "small" .)