Regularly uproot last row to get vegetable (6)
I believe the answer is:
potato
'vegetable' is the definition.
(potatoes are sometimes considered vegetables)
'regularly uproot last row' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'uproot'+'last'+'row'='uprootlastrow'
The alternating letters of 'uprootlastrow' are 'POTATO'.
'to get' acts as a link.
(Other definitions for potato that I've seen before include "Spud (6)" , "Edible tuber; hole in stocking (colloq.)" , "Root vegetable" , "Would be difficult to deal with if hot" , "The humble spud" .)