Against current, displeasure with bat (7)
I believe the answer is:
vampire
'bat' is the definition.
(vampire bat is a type of bat)
'against current displeasure' is the wordplay.
'against' becomes 'v' (abbreviation for 'versus').
'current' becomes 'amp' (electricity).
'displeasure' becomes 'ire' (I've seen this before).
'v'+'amp'+'ire'='VAMPIRE'
'with' acts as a link.
(Other definitions for vampire that I've seen before include "Nosferatu, for example" , "Body that rises at night to drink the blood of the living" , "fabulous creature" , "Dracula is one" , "eg Dracula" .)