Caramel custard (4)
I believe the answer is:
flan
'caramel custard' is the definition.
(I know that caramel custard can be written as flan)
This is all the clue.
(Other definitions for flan that I've seen before include "Open tart with a sweet or savoury filling" , "Quiche" , "dish, sweet or savoury" , "Open pastry or sponge case with tasty filling" , "Open-topped pie" .)