Top banana regarded as not looking straight (4,4)
I believe the answer is:
boss eyed
'not looking straight' is the definition.
(I've seen this before)
'top banana regarded' is the wordplay.
'top banana' becomes 'boss' (I've seen this in another clue).
'regarded' becomes 'eyed' (I've seen this in another clue).
'boss'+'eyed'='BOSS-EYED'
'as' is the link.
(Other definitions for boss eyed that I've seen before include "Squinting" , "not looking straight" .)