Associate new parent with resistance (7)
I believe the answer is:
partner
'associate' is the definition.
(partner is a kind of associate)
'new parent with resistance' is the wordplay.
'new' is an anagram indicator.
'with' is an insertion indicator.
'resistance' becomes 'r' (abbreviation).
'parent' with letters rearranged gives 'patner'.
'patner' placed around 'r' is 'PARTNER'.
(Other definitions for partner that I've seen before include "A person dancing with another" , "Husband or wife" , "Dancing companion" , "Either member of a couple" , "One sharing home or business" .)