Drug taking around umpteenth rave (7)

I believe the answer is:

enthuse

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

I can't explain the remainder of the clue.

(Other definitions for enthuse that I've seen before include "Cheer" , "Fill with keenness" , "Get passionate" , "Inspire with keenness" , "Seen hut? (anag) - show a lively interest" .)

I've seen this clue in The Telegraph.

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