Revolves (5)
'revolves' is the definition.
('roll' can be a synonym of 'revolve')
This is all the clue.
(Other definitions for rolls that I've seen before include "breakfast food" , "moves along on wheels" , "Moves by turning" , "Turns over - luxury car (abbr)" , "Trundles" .)
(Other definitions for turns that I've seen before include "Goes off" , "Changes direction" , "Bends" , "Moves in a new direction" , "Revolves" .)