Took off
'took off' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for imitated that I've seen before include "Followed" , "Took off" , "Aped, copied" , "most sincerely flattered?" , "Copied, simulated" .)
(Another definition for impersonated that I've seen is " Pretended to be (someone)".)
'took off' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for left that I've seen before include "quit" , "Gone away - remaining" , "choice at a junction?" , "Allowed to remain" , "not consumed" .)