Suggestion about container for vegetable (6)
I believe the answer is:
turnip
'vegetable' is the definition.
(turnip is a kind of vegetable)
'suggestion about container' is the wordplay.
'suggestion' becomes 'tip' (tip is a kind of suggestion).
'about' means one lot of letters goes inside another.
'container' becomes 'urn' (urn is a kind of container**).
'tip' going around 'urn' is 'TURNIP'.
'for' is the link.
(Other definitions for turnip that I've seen before include "food item" , "Large-rooted vegetable related to the cabbage" , "what you eat?" , "'Root vegetable, yellow or white (6)'" , "veggie" .)