Nosferatu tore off in a flutter (5)
Nosferatu - (tore)
In a flutter anag. ind.
Def. Flutter - to throw into disorder
Annoyingly, after taking quite some time putting the clue together, I realised that Nosferatu (Count Orlok) couldn't change into a bat, in spite of being a vampire. The clue still works, but would have been better with flutter being linked to a bat.