Vegetable from tree transported in sack (8)
I believe the answer is:
beetroot
'vegetable' is the definition.
(beetroot is a kind of vegetable)
'tree transported in sack' is the wordplay.
'transported' indicates an anagram.
'in' indicates putting letters inside.
'sack' becomes 'boot' (I've seen this in another clue).
'tree' with letters rearranged gives 'eetr'.
'eetr' put inside 'boot' is 'BEETROOT'.
'from' is the link.
(Other definitions for beetroot that I've seen before include "Essential ingredient in borsch" , "one to get pickled" , "Dark red root eaten as a vegetable" , "plant" , "salad ingredient" .)