Turn to be enthralled by Corot at exhibition (6)
I believe the answer is:
rotate
'turn' is the definition.
(rotating is a kind of turning)
'enthralled by corot at exhibition' is the wordplay.
'enthralled by' indicates the answer is hidden within the clue.
'ROTATE' is hidden within 'corot at exhibition'.
'to be' is the link.
(Other definitions for rotate that I've seen before include "roll" , "Gyrate" , "Move round centre" , "Spin round" , "Go around" .)