Special detail (10)
I believe the answer is:
particular
This clue is a double definition.
'special' is the first definition.
(I know that special can be written as particular)
'detail' is the second definition.
(I know that detail can be written as particular)
(Other definitions for particular that I've seen before include "Exceptional" , "Respect" , "Fog over London" , "Fussy" , "Specific" .)