Spanish custard (4)
I believe the answer is:
flan
'spanish custard' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for flan that I've seen before include "it may get jammed" , "dish, sweet or savoury" , "Quiche" , "Sweet/savoury open tart" , "Open pastry or sponge case with tasty filling" .)