Buzzkill [bat, elk, newt] (3,7)

I believe the answer is:

wet blanket

(Other definitions for wet blanket that I've seen before include "misery" , "Person spoiling others' pleasure" , "Depressing person with lack of spirit" , "what could moisten kippers" , "Depressing non-participant - soggy covering" .)

I've seen this clue in The New York Times.

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