Turkish leader Afghan regularly avoided (3)
I believe the answer is:
aga
'turkish leader' is the definition.
(I've seen this before)
'afghan regularly avoided' is the wordplay.
'regularly avoided' means one should take alternating letters.
The alternate letters of 'afghan' are 'AGA'.
(Other definitions for aga that I've seen before include "Type of stove" , "Kitchen range" , "- Khan, Ismaili leader" , "Muslim title of honour" , "... Khan is a spiritual Muslim leader" .)