Painstaking detail (10)
I believe the answer is:
particular
I believe this clue is a double definition.
'painstaking' is the first definition.
(thesaurus)
'detail' is the second definition.
('particular' can be a synonym of 'detail')
(Other definitions for particular that I've seen before include "Meticulous" , "going into detail" , "Fog over London" , "Special" , "Fussy" .)