Crossword Genius

Organ in the immune system (6)

Ross

I believe the answer is:

spleen

(Other definitions for spleen that I've seen before include "Body organ; spite" , "Abdominal organ - bad temper" , "Bodily organ associated with bad temper" , "Acrimony" , "Peevishness, from bodily organ" .)

I've seen this clue in the Universal.
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