Particular courtesy (7)
I believe the answer is:
respect
I believe this clue is a double definition.
'particular' is the first definition.
(both can mean a detail or matter for consideration)
'courtesy' is the second definition.
(I know that respect is a type of courtesy)
(Other definitions for respect that I've seen before include "Observe" , "value" , "Have high regard for sceptre" , "Show deference (to)" , "to abide by" .)