Jelly holder (3)
I believe the answer is:
jar
'jelly holder' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for jar that I've seen before include "Pint glass of beer, perhaps" , "Grate" , "Container; be incongruous" , "Shock; container" , "Glass of beer; clash" .)