Crossword Genius

Hooligan feeling unwell (5)

Ross

I believe the answer is:

rough

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'hooligan' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rough that I've seen before include "Imprecise" , "Hooligan - lacking refinement" , "Not gentle or restrained" , "general" , "'Coarse, rugged (5)'" .)

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