Critical sort of mood (10)

I believe the answer is:

imperative

I believe this clue is a double definition.

'critical' is the first definition.
(thesaurus)

'sort of mood' is the second definition.

(Other definitions for imperative that I've seen before include "Absolutely necessary" , "Extremely important" , "Crucial" , "Essential" , "mood" .)

I've seen this clue in The Telegraph.

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