Moves smoothly (5)
'moves smoothly' is the definition.
('flow' can be a synonym of 'move smoothly')
This is the entire clue.
(Another definition for flows that I've seen is " runs".)
'moves smoothly' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for glides that I've seen before include "Flies without an engine" , "Sails or floats on high" , "Moves smoothly over surface" , "Flies without power" , "Moves along smoothly as on skates" .)