Manic worker ruined atmosphere (8)

I believe the answer is:

ambience

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'atmosphere' is the definition.
(synonyms)

I don't understand the rest of the clue.

(Other definitions for ambience that I've seen before include "Surroundings or atmosphere" , "Place's atmosphere" , "Suitable surroundings for manic bee" , "Surrounding atmosphere" , "Environment, surroundings" .)

I've seen this clue in The Irish Times.

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