Gym shoes (8)
'gym shoes' is the definition.
(plimsoll is a kind of gym shoe)
This is all the clue.
'gym shoes' is the definition.
('sneaker' can be a synonym of 'gym shoe')
This is all the clue.
(Other definitions for sneakers that I've seen before include "soft-soled canvas shoes" , "going on foot" , "Casual shoes" , "Soft shoes" , "Canvas shoes with rubber soles" .)