Plum tomato type (4)
I believe the answer is:
roma
'plum tomato type' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for roma that I've seen before include "Members of a nomadic people" , "Travelling people" , "Travellers; Italian capital" , "capital for > gypsy men" , "Travellers, gypsies" .)