Deconstructing Proust produces lethargy (6)

I believe the answer is:

stupor

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

'lethargy' is the definition.
(I've seen this in another clue)

'deconstructing proust' is the wordplay.
'proust' anagrams to 'STUPOR'.
Though, I'm unsure how this is indicated.

'produces' is the link.

Can you help me to learn more?

(Other definitions for stupor that I've seen before include "Suspension of sensibility" , "State of bewilderment" , "Mental torpor" , "Daze, semi-consciousness" , "Inertia results!" .)

I've seen this clue in The Guardian.

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