Silver wrapped up in note for priests (4)
I believe the answer is:
magi
'priests' is the definition.
(magus is a kind of priest)
'silver wrapped up in note' is the wordplay.
'silver' becomes 'ag' (Ag is the chemical symbol for silver).
'wrapped up in' is an insertion indicator.
'note' becomes 'mi' (as in 'do re mi'**).
'ag' inserted inside 'mi' is 'MAGI'.
'for' is the link.
(Other definitions for magi that I've seen before include "Caspar, Melchior and Balthasar" , "men on special quest" , "members of priestly caste" , "The sages who visited Jesus and Mary and Joseph shortly after Jesus was born" , "Nativity story wise men" .)