Demanding detail (10)
I believe the answer is:
particular
I believe this is a double definition.
'demanding' 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 "Fog over London" , "Fussy" , "going into detail" , "Specific" , "Fastidious; individual" .)