Particular place is in ruins (7)
I believe the answer is:
special
'particular' is the definition.
(I know that particular can be written as special)
'place is in ruins' is the wordplay.
'in ruins' is an anagram indicator.
'place'+'is'='placeis'
'placeis' anagrammed gives 'SPECIAL'.
(Other definitions for special that I've seen before include "Distinctive, exceptional" , "Bargain" , "Dish not on main menu" , "Unusual, superior" , "Particularly favoured" .)