Rereading Proust produces a state of mental inertia (6)

I believe the answer is:

stupor

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'inertia' is the definition.
(thesaurus)

'rereading proust produces a state of mental' is the wordplay.
'proust' anagrams to 'STUPOR'.
Though, 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 "Dazed, unconscious, state" , "Dazed condition as from drink or drugs" , "state of somnolence" , "State of lethargy" , "Dazed or unconscious condition, sometimes caused by alcohol" .)

I've seen this clue in The Guardian.

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