Open pastry (4)
I believe the answer is:
flan
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">open pastry</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for flan that I've seen before include "it may get jammed" , "Baked and filled pastry case dish" , "Open pastry case with savoury filling" , "dish, sweet or savoury" , "Open-topped pastry dish" .)