Crossword Genius

A funny mood? (6)

Ross

I believe the answer is:

humour

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'a funny mood?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is the entire clue.

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(Other definitions for humour that I've seen before include "Temperament; comedy" , "A funny thing" , "A sense of . . . . . . - the quality of enjoying amusing things" , "Gratify by compliance" , "Quality of funniness" .)

I've seen this clue in the Evening Standard.
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