Jelly container (3)
I believe the answer is:
jar
'jelly container' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for jar that I've seen before include "Wide-mouthed container" , "Grate" , "Wide-mouthed vessel" , "Jolt with glass container" , "Container; be incongruous" .)