Agree with one aspect (4)
I believe the answer is:
side
This clue is a double definition.
'agree' is the first definition.
(I've seen this in another clue)
'one aspect' is the second definition.
(I know that side is a type of aspect)
'with' acts as a link.
(Other definitions for side that I've seen before include "TV channel" , "perspective" , "Dies (anag)" , "[MAN U], perhaps" , "Left or right, say" .)