Roughly trample front of edible plant from the tropics (4,4)
I believe the answer is:
palm tree
'plant from the tropics' is the definition.
(tropical plant)
'roughly trample front of edible' is the wordplay.
'roughly' indicates an anagram.
'front of' suggests taking the first letters.
The initial letter of 'edible' is 'e'.
'trample' is an anagram of 'palmtre'.
'palmtre'+'e'='PALM-TREE'
(Other definitions for palm tree that I've seen before include "Coconut plant" , "Tropical plant with unbranched trunk" , "One may supply dates" , "Its fruit may be dates or coconuts" , "plant to yield oil" .)