Religious text in Greek or Anatolian (5)
I believe the answer is:
koran
'religious text' is the definition.
(Koran is an example)
'in greek or anatolian' is the wordplay.
'in' says the answer is hidden in the clue.
'KORAN' can be found hidden inside 'greek or anatolian'.
(Other definitions for koran that I've seen before include "Holy book of Islam" , "The Muslim Scriptures in Arabic" , "Sacred writings of Islam" , "Sacred book of Islam (5)" , "Sacred Islamic writings" .)