Unorthodox person (8)
I believe the answer is:
maverick
'unorthodox person' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for maverick that I've seen before include "Person with independent or unorthodox views" , "Non-conformer" , "Determined individualist" , "Person showing great independence of thought or action" , "One who ignores the party line" .)