Draw on nationalist symbol (5)
I believe the answer is:
token
'symbol' is the definition.
(I know that token is a type of symbol)
'draw on nationalist' is the wordplay.
'draw' becomes 'toke' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'nationalist' becomes 'n' (abbreviation in politics).
'toke'+'n'='TOKEN'
Can you help me to learn more?
(Other definitions for token that I've seen before include "Sign, symbol or an evidence" , "empty gesture?" , "Sign, maybe substitute for the real thing" , "Counter" , "without meaning it" .)