Some antagonism, some of which is intended (5)
I believe the answer is:
meant
'is intended' is the definition.
(to mean something is to intend it)
'some antagonism some of' is the wordplay.
'some of' indicates the answer is hidden within the clue.
'MEANT' is hidden within 'some antagonism'.
'which' is the link.
(Other definitions for meant that I've seen before include "Intended, had in mind" , "Intentional" , "represented" , "designed" , "Denoted" .)