The first Generalissimo seems out of it? (8)
I believe the answer is:
original
'the first' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for original that I've seen before include "In first form" , "Archetypal" , "Not copied or imitated" , "Not derived or copied from anything else" , "Pristine; innovative" .)