Dazed state possibly produced by Proust (6)

I believe the answer is:

stupor

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

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

'produced by proust' is the wordplay.
'proust' can be anagrammed to 'STUPOR'.
Though, I'm unsure how the anagram is indicated.

'possibly' is the link.

Can you help me to learn more?

(Other definitions for stupor that I've seen before include "state of somnolence" , "Suspension of sensibility" , "State of dazedness or bemusement" , "Coma - lassitude" , "Stupefaction, daze" .)

I've seen this clue in The Globe and Mail.

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