I see cop baffled before robber returns carrying scrap of gold and silver (6,2,5)
I believe the answer is:
pieces of eight
'silver' is the definition.
(historical silver coins)
'i see cop baffled before robber returns carrying' is the wordplay.
'baffled' is an anagram indicator.
'before' becomes 'g' (I can't justify this - if you can you should believe this answer much more).
'robber' becomes 'thief' (both can mean someone who steals).
'returns' shows that the letters should be reversed in order.
'carrying' means one lot of letters goes inside another.
'thief' backwards is 'feiht'.
'g' placed into 'feiht' is 'feight'.
'i'+'see'+'cop'='iseecop'
'iseecop' is an anagram of 'pieceso'.
'pieceso'+'feight'='PIECES OF EIGHT'
'scrap of gold and' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
(Other definitions for pieces of eight that I've seen before include "Spanish dollars" , "Old Spanish coins (sought by pirates)" , "Old Spanish coins - Long John Silver's parrot's cry" , "In old money" , "2 and 6 perhaps" .)