Cover ripe bananas, then charge too much (9)
I believe the answer is:
overprice
'charge too much' is the definition.
(I've seen this before)
'cover ripe bananas' is the wordplay.
'bananas' indicates anagramming the letters (bananas can informally mean crazy).
'cover'+'ripe'='coverripe'
'coverripe' with letters rearranged gives 'OVERPRICE'.
'then' is the link.
(Other definitions for overprice that I've seen before include "Ask too much for (item)" , "Charge too much" .)