A Turner (3)
I believe the answer is:
ike
'a turner' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ike that I've seen before include "Thirty fourth US president's nickname" , "Nickname of old US president" , "US general who became president, in short" , "Former US President (informally)" , "President Eisenhower's nickname" .)