Disadvantage: partial hitch, and I capitulate (8)
I believe the answer is:
handicap
'disadvantage' is the definition.
(I know that disadvantage is the is a more specific form of the action of handicap.)
'partial hitch and i capitulate' is the wordplay.
'partial' says the answer is hidden in the clue.
'HANDICAP' is hidden in the letters of 'hitch and i capitulate'.
(Other definitions for handicap that I've seen before include "race" , "Physical or mental disability, sometimes imposed" , "hamper" , "Disadvantage imposed on competitor to equalise chances" , "Advantage given to equalise chances of winning" .)