Completely opposed to being in and left (8)
I believe the answer is:
outright
'completely' is the definition.
(outright means completely or totally)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for outright that I've seen before include "Without qualification" , "Completely - undisputed" , "Immediately; openly" , "Without restriction or reservation" , "Clear" .)