Though particular the place is in a mess (7)
I believe the answer is:
'though particular' is the definition.
(I've seen this before)
'the place is in a mess' is the wordplay.
'in a mess' is an anagram indicator.
'placeis' with letters rearranged gives 'SPECIAL'.
(Other definitions for special that I've seen before include "Out of the ordinary, singular" , "Dish not on usual menu" , "Individual" , "Particular, peculiar" , "Distinctive, exceptional" .)