Produce good-hearted vegetable (5)
I believe the answer is:
beget
'produce' is the definition.
(I've seen this in another clue)
'good-hearted vegetable' is the wordplay.
'good' becomes 'g' (abbreviation).
'hearted' indicates putting letters inside (some letters go to the heart of the word).
'vegetable' becomes 'beet' (beet is a kind of vegetable).
'g' put inside 'beet' is 'BEGET'.
(Other definitions for beget that I've seen before include "Give rise to; create (children)" , "Bring about, cause" , "Engender" , "Sire" , "Father" .)