Quick and cheerful enthusiasm (8)

I believe the answer is:

alacrity

'quick and cheerful enthusiasm' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for alacrity that I've seen before include "Cheerful willingness" , "Prompt and eager readiness" , "Liveliness and eagerness" , "Showing brisk readiness" , "'Briskness, promptness (8)'" .)

I've seen this clue in The Guardian, the Irish Times (Simplex) and The Irish Times.

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