A small token for delegate (6)
I believe the answer is:
assign
'for delegate' is the definition.
(synonyms)
'a small token' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'token' becomes 'sign' (I've seen this before).
'a'+'s'+'sign'='ASSIGN'
(Other definitions for assign that I've seen before include "grant" , "Allocate; designate" , "Appoint or ascribe." , "Allocate or transfer" , "Give or entrust to" .)