Marks's partner uncovered small change (5)
I believe the answer is:
pence
'small change' is the definition.
(pennies)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pence that I've seen before include "Fractions of a pound" , "Lowest denomination of British currency" , "p" , "Old coins" , "Small sum of money" .)