Point duty (6)
I believe the answer is:
detail
This clue is a double definition.
'point' is the first definition.
(I know that point can be written as detail)
'duty' is the second definition.
(I've seen this before)
(Other definitions for detail that I've seen before include "Small fact or feature" , "Respect" , "A point or aspect of" , "analysts may go into" , "Tailed into particulars" .)