Supporter of lease renewal (5)

I believe the answer is:

easel

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

'supporter' is the definition.

'lease renewal' is the wordplay.
'lease' can be anagrammed to 'EASEL'.
However, I am not clear how this is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for easel that I've seen before include "Stand used by artists" , "Painter's frame" , "Artist's wooden frame" , "stand supporting artistic effort" , "Painter's support" .)

I've seen this clue in the Evening Standard.

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