Walks over relative (7)
I believe the answer is:
stepson
'relative' is the definition.
(stepson is a kind of relative)
'walks over' is the wordplay.
'walks' becomes 'steps' (I've seen this in another clue).
'over' becomes 'on' (physically on top of).
'steps'+'on'='STEPSON'
(Other definitions for stepson that I've seen before include "indirectly related issue" , "Child of a spouse by a former marriage" , "boy not sharing blood" , "Subdues" , "Child from a spouse's former marriage" .)