Girl among Americans
I believe the answer is:
erica
'girl' is the definition.
'among americans' is the wordplay.
'among' indicates a hidden word.
'ERICA' can be found hidden inside 'americans'.
(Other definitions for erica that I've seen before include "Shrub genus; girl's name" , "Plant of the heath genus" , "I care (anag) - plant - girl" , "ling" , "growing up on the moors" .)