Peers out on wilful indulgence (5)

I believe the answer is:

spree

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'wilful indulgence' is the definition.
'spree' can be an answer for 'indulgence' (I've seen this in another clue). I am unsure of the 'wilful' bit.

'peers out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'peers' with letters rearranged gives 'SPREE'.

'on' acts as a link.

Can you help me to learn more?

(Other definitions for spree that I've seen before include "Drunken bout" , "Spell of wild activity" , "Unrestrained bout" , "Spending bout" , "Carefree, lively outing" .)

I've seen this clue in The Mirror.

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