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 a hidden word.
'MEANT' is hidden in the letters of 'some antagonism'.
'which' is the link.
(Other definitions for meant that I've seen before include "Intended, had in mind" , "Intentional" , "represented" , "designed" , "Denoted" .)