Task force in dock? (6)
I believe the answer is:
detail
This clue is a triple definition!
'task' is the first definition.
(I have seen 'special task' mean 'detail' so perhaps 'task' could also mean 'detail')
'force' is the second definition.
(detail is a kind of force)
'in' acts as a link.
'dock?' is the third definition.
(dock can mean to remove a tail, as in de-tail)
(Other definitions for detail that I've seen before include "Tailed into minutiae" , "Small point" , "Dilate with individual item" , "Troop detachment; small feature" , "Lead it (anag)" .)