Vampire perhaps in abattoir (3)
I believe the answer is:
bat
'vampire perhaps' is the definition.
(vampire bat)
'in abattoir' is the wordplay.
'in' indicates the answer is hidden within the clue.
'BAT' is hidden in the letters of 'abattoir'.
(Other definitions for bat that I've seen before include "Cricketer; mammal" , "Small flying mammal, may be vampire" , "Nocturnal mouselike mammal" , "Wooden implement for cricket" , "Nocturnal flier" .)