Relies on unknown artist who wants to remain unknown (6)

I believe the answer is:

banksy

'artist who wants to remain unknown' is the definition.
(pseudonymous English street artist)

'relies on unknown' is the wordplay.
'relies' becomes 'banks' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'unknown' becomes 'y' (algebra).
'banks'+'y'='BANKSY'

I've seen this clue in The Guardian.

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