Hooligan in crowd, yelling (5)
I believe the answer is:
rowdy
'hooligan' is the definition.
('rowdy' can be a synonym of 'hooligan')
'in crowd yelling' is the wordplay.
'in' indicates a hidden word.
'ROWDY' is hidden within 'crowd yelling'.
(Other definitions for rowdy that I've seen before include "Noisy and unruly" , "Noisy and disorderly" , "Uproarious" , "Loud and disorderly" , "yob" .)