Turkish leader elected twice (5)
I believe the answer is:
again
'twice' is the definition.
(I've seen this in another clue)
'turkish leader elected' is the wordplay.
'turkish leader' becomes 'aga' (I've seen this in other clues).
'elected' becomes 'in' (in government).
'aga'+'in'='AGAIN'
(Other definitions for again that I've seen before include "Moreover - a second time" , "Predictably perhaps" , "Here we go ___" , "On the other hand" , "10 10 [AGAIN" .)