Asian influence ultimately in holy text (6)
I believe the answer is:
korean
'asian' is the definition.
(someone from North or South Korea)
'influence ultimately in holy text' is the wordplay.
'ultimately' indicates one should take the final letters.
'in' indicates putting letters inside.
'holy text' becomes 'koran' (I've seen this in another clue).
The final letter of 'influence' is 'e'.
'e' going into 'koran' is 'KOREAN'.
(Other definitions for korean that I've seen before include "From Seoul or Pyongyang?" , "From Pyongyang, perhaps" , "Citizen of divided country" , "Asian national" , "Eg, from Seoul" .)