Bizarre type of route (5)
I believe the answer is:
outre
'bizarre' is the definition.
(I know that bizarre can be written as outre)
'type of route' is the wordplay.
'type of' indicates an anagram (I've seen 'type' mean this).
'route' with letters rearranged gives 'OUTRE'.
(Other definitions for outre that I've seen before include "Deviating from what is proper" , "Deviating from normal" , "Unusual, a bit shocking" , "flamboyant" , "flaky" .)