Particular, exceptional (7)
I believe the answer is:
special
This clue is a double definition.
'particular' is the first definition.
(I know that particular can be written as special)
'exceptional' is the second definition.
(I know that exceptional can be written as special)
(Other definitions for special that I've seen before include "Rare, valuable" , "sort of officer" , "Unusual, superior" , "Dish not on regular menu" , "Though particular" .)