… comedy blood? (6)

I believe the answer is:

humour

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This clue could be a double definition.

'comedy' is the first definition.

'blood?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

Can you help me to learn more?

(Other definitions for humour that I've seen before include "Wit" , "Quality of funniness" , "jokes!" , "Mood - comicality" , "Gratify by compliance" .)

I've seen this clue in The Guardian.

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