Vegetable container found in dump (6)
I believe the answer is:
turnip
'vegetable' is the definition.
(I know that turnip is a type of turnip)
'container found in dump' is the wordplay.
'container' becomes 'urn' (urn is a kind of container).
'found in' means one lot of letters goes inside another.
'dump' becomes 'tip' (as in a rubbish tip).
'urn' put into 'tip' is 'TURNIP'.
(Other definitions for turnip that I've seen before include "Plant with round white root used as vegetable" , "veggie" , "Globular food plant" , "Large-rooted vegetable related to the cabbage" , "Root vegetable of the mustard family" .)