Earliest, original (6)
I believe the answer is:
primal
I believe this is a double definition.
'earliest' is the first definition.
(I've seen this in another clue)
'original' is the second definition.
(synonyms)
(Other definitions for primal that I've seen before include "typifying some fear?" , "From a very early time" , "Existing from the beginning, basic" , "First; primitive" , "Relating to an early stage of evolution" .)