Minor reference to cash? (5)
I believe the answer is:
petty
'minor' is the definition.
(I've seen this in another clue)
'reference to cash?' is the wordplay.
'reference' becomes 'etty' (I am not sure about this - if you are sure you should believe this answer much more).
'to' says to put letters next to each other (I've seen this in other clues).
'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 "Marked by narrowness of mind" , "Inferior" , "small" , "Unimportant" , "Trivial, piffling" .)