Crossword Genius

Bad mood comes to prominence (4)

Ross

I believe the answer is:

hump

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'to prominence' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for hump that I've seen before include "Protuberance on back, road etc" , "A dromedary has one" , "sleeping policeman" , "Protuberance; (the) sulks" , "Rounded protuberance" .)

I've seen this clue in The Sun.
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