Top Gear could be rather passé (3-3)
I believe the answer is:
old-hat
I believe this is a double definition.
'top gear' is the first definition.
(gear for one's head or top)
'rather passe' is the second definition.
(old hat can mean old-fashioned or passe)
'could be' acts as a link.
(Other definitions for old-hat that I've seen before include "Out-of-date" , "On the way out" , "Trite, hackneyed" .)