Spanish-American farm worker (4)
I believe the answer is:
peon
'spanish-american farm worker' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for peon that I've seen before include "A Mexican peasant or labourer" , "Spanish-American menial worker" , "Latin American farm labourer" , "Spanish-American farm worker" , "Spanish-American farm labourer" .)