Religious writings featured in Dave's talks (6)
I believe the answer is:
avesta
'religious writings' is the definition.
(sacred texts of Zoroastrianism)
'featured in dave's talks' is the wordplay.
'featured in' indicates the answer is hidden within the clue.
'AVESTA' is hidden within 'daves talks'.
(Other definitions for avesta that I've seen before include "collection of holy writings" , "holy scriptures" , "sacred text" , "Religious texts" , "holy text" .)