Place to park behind North American dressed like Batman? (6)
I believe the answer is:
canape
This clue might be a double definition.
'place to park behind' is the first definition.
(one might park their behind on a canape sofa)
'north american dressed like batman?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
(Other definitions for canape that I've seen before include "Small biscuit with savoury on top" , "Small piece of bread or biscuit with savoury spread" , "Small item of food served with drinks" , "Savoury party fare" , "Party nibble" .)