Slide; undergarment (4)
I believe the answer is:
slip
I believe this is a double definition.
'slide' is the first definition.
(I know that slide can be written as slip)
'undergarment' is the second definition.
(slip is a kind of undergarment)
(Other definitions for slip that I've seen before include "Minor mistake - undergarment" , "Underwear" , "One on cricket field" , "Clay, water mix; fielder" , "Strip" .)