Hooligan gathering support: that’s arranged (4,3)
I believe the answer is:
laid out
'arranged' is the definition.
(laying out is a kind of arranging)
'hooligan gathering support' is the wordplay.
'hooligan' becomes 'lout' (I've seen this before).
'gathering' means one lot of letters goes inside another.
'support' becomes 'aid' ('aid' can be a synonym of 'support'**).
'lout' placed around 'aid' is 'LAID OUT'.
'that's' is the link.
(Other definitions for laid out that I've seen before include "Displayed; knocked senseless" , "Knocked unconcious" , "Paid" , "boxer risks being this" , "prepared for burial" .)