Bad temper (3)

I think it could be either:

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spleen

'bad temper' is the definition.
(informal term for bad temper)

This is all the clue.

(Other definitions for spleen that I've seen before include "Body organ; spite" , "Organ supposedly controlling temper" , "Quick temper -- spite" , "Bitterness - body organ" , "Organ of the body and short temper" .)

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

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