A South American and one English woman (5)
I believe the answer is:
susie
'woman' is the definition.
'a south american and one english' is the wordplay.
'a south american' becomes 'sus' (I've seen this in other clues).
'and' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'english' becomes 'e' (abbreviation).
'sus'+'i'+'e'='SUSIE'
(Other definitions for susie that I've seen before include "Little Susannah" , "Woman" , "Tongue-twister sister sewing shirts for soldiers" , "Wake Up Little - (Everly Brothers)" , "Old song: ''If you knew . . . . . like I know . . . . .''" .)