Item in dock? (6)
I believe the answer is:
detail
I believe this clue is a double definition.
'item' is the first definition.
(I know that item can be written as detail)
'dock?' is the second definition.
(dock can mean to remove a tail, as in de-tail)
'in' is the link.
(Other definitions for detail that I've seen before include "Specify" , "Special military group" , "document?" , "Troop detachment; small feature" , "Dilate with individual item" .)