Crush underfoot (7)
I believe the answer is:
trample
'crush underfoot' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trample that I've seen before include "Tread on, crush" , "Traipse over" , "Ruthlessly crush -- nut performed a lot (anag)" , "Insult" , "Tread roughly underfoot" .)