President Erdogan holds the key (5)
I believe the answer is:
enter
'the key' is the definition.
(key on a computer keyboard)
'president erdogan holds' is the wordplay.
'holds' indicates the answer is hidden within the clue.
'ENTER' is hidden within 'president erdogan'.
(Other definitions for enter that I've seen before include "Treen (anag.)" , "Set foot in" , "Get in" , "Come in - register" , "Register formally as a participant" .)