Possibly retains, though being less agreeable (7)
I believe the answer is:
nastier
'being less agreeable' is the definition.
(nasty can mean disagreeable)
'possibly retains' is the wordplay.
'possibly' indicates an anagram.
'retains' is an anagram of 'NASTIER'.
'though' acts as a link.
(Other definitions for nastier that I've seen before include "More unpleasant or distasteful" , "More disgusting" , "more aggressive" , "Retsina (anag) -- not so nice" , "Less nice" .)