Some important Rastafarian religious writings (6)
I believe the answer is:
tantra
'religious writings' is the definition.
(ancient Hindu or Buddhist religious writing)
'some important rastafarian' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'TANTRA' can be found hidden inside 'important rastafarian'.
(Other definitions for tantra that I've seen before include "Magic text" , "Sacred books" , "Mystical Buddhist text" , "Religious writings" , "Religious text" .)