Hooligan feeling unwell (5)
I believe the answer is:
rough
'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)'" .)