Flip-flop, for one (6)
I believe the answer is:
sandal
'flip-flop for one' is the definition.
(I know that flip-flop is a type of sandal)
This is all the clue.
(Other definitions for sandal that I've seen before include "Light open-toed shoe" , "Informal shoe" , "An open shoe for summer" , "One can go on foot" , "what may be afoot" .)