Petrosian will need to play to find sponsor (9)

I believe the answer is:

patronise

I'm a little stuck... Click here to teach me more about this clue!

'sponsor' is the definition.
(I've seen this before)

'petrosian will need to play to' is the wordplay.
'petrosian' anagrams to 'PATRONISE'.
But, I am unsure how the anagram is indicated.

'find' acts as a link.

Can you help me to learn more?

(Other definitions for patronise that I've seen before include "Sponsor" , "Finance" , "champion" , "Talk down to" , "Give encouragement or treat with condescension" .)

I've seen this clue in The Independent.

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