Sneaker or pump (4)
I believe the answer is:
shoe
I believe this is a double definition.
'sneaker' is the first definition.
(I've seen this in another clue)
'pump' is the second definition.
(I've seen this in another clue)
(Other definitions for shoe that I've seen before include "Footwear - playing-card dispenser - part of a brake" , "eg Trainer" , "Case for cards in a casino" , "One of the things racehorse needs" , "Flash socket on camera" .)