Parent is about right to become more distant (7)
I believe the answer is:
farther
'more distant' is the definition.
(more far away)
'parent is about right' is the wordplay.
'parent' becomes 'father' (type of parent).
'is about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'father' enclosing 'r' is 'FARTHER'.
'to become' is the link.
(Other definitions for farther that I've seen before include "Beyond; her raft (anag)" , "More distant" , "Over a greater distance" , "longer" .)