One looks down on others (4)
I believe the answer is:
snob
'one looks down on others' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for snob that I've seen before include "who puts on airs" , "Stuck-up person" , "Toffee-nose" , "One for whom social status matters" , "Old cobbler" .)