Tramples (7)
I believe the answer is:
stepson
'tramples' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for stepson that I've seen before include "No pests (anag)" , "No pests about this relation by marriage" , "boy not sharing blood" , "could be issue for partner" , "Male child of spouse by earlier marriage" .)