Organised fight in temporary accommodation, that’s clear (11)
I believe the answer is:
transparent
'clear' is the definition.
('transparent' can be similar in meaning to 'clear')
'organised fight in temporary accommodation' is the wordplay.
'organised' becomes 'ran' (I've seen this before).
'fight' becomes 'spar' (sparring is a kind of fighting**).
'in' means one lot of letters goes inside another.
'temporary accommodation' becomes 'tent' (I've seen this before).
'ran'+'spar'='ranspar'
'ranspar' placed inside 'tent' is 'TRANSPARENT'.
'that's' is the link.
(Other definitions for transparent that I've seen before include "unmistakable" , "See-through - easily understood" , "Obvious - ingenuous" , "Unpolluted" , "Sheer" .)