Maybe no gloom after Republican ousts Democrat (9)

I believe the answer is:

rejection

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'maybe no' is the definition.
'rejection' can be an answer for 'no' (thesaurus). I am unsure of the 'maybe' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rejection that I've seen before include "Refusal, renunciation" , "Brush-off" , "Refusal - treatment as worthless" .)

I've seen this clue in The Times.

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