Relative to resist move (6)
I believe the answer is:
sister
'relative' is the definition.
(sister is a kind of relative)
'resist move' is the wordplay.
'move' indicates anagramming the letters.
'resist' with letters rearranged gives 'SISTER'.
'to' acts as a link.
(Other definitions for sister that I've seen before include "twin?" , "A relative to resist" , "Resist about the sibling" , "habits' - one who has them" , "Resist (anag) - nurse" .)