Proust in a daze (6)

I believe the answer is:

stupor

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

'in a daze' is the definition.
(I've seen this before)

'proust' is the wordplay.
'proust' anagrams to 'STUPOR'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for stupor that I've seen before include "lethargic" , "Coma - lassitude" , "Dazed or unconscious condition, sometimes caused by alcohol" , "Daze, semi-consciousness" , "Coma, lethargy" .)

I've seen this clue in The Irish Independent.

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