Extremely unconventional (3-3)
I believe the answer is:
way-out
'extremely unconventional' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for way-out that I've seen before include "Unconventional; exit" , "Exit, means of egress" , "Exit - weird" , "Offbeat" , "Extremely unconventional" .)