Peter's money? (5)
I believe the answer is:
pence
'money?' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for pence that I've seen before include "Lowest denomination of British currency" , "Low-value coinage" , "British coins" , "Small coppers" , "Small change" .)