Turns and leaves (4)
I believe the answer is:
goes
I believe this clue is a double definition.
'turns' is the first definition.
(going is a kind of turning)
'leaves' is the second definition.
(I've seen this in another clue)
'and' acts as a link.
(Other definitions for goes that I've seen before include "Moves" , "Travels; attempts" , "SECOND PART OF 21" , "Leaves; operates" , "See 4" .)