Shrubs from the Americas (6)
I believe the answer is:
ericas
'shrubs from the americas' is the definition.
'ericas' can be an answer for 'shrubs' (erica is a kind of shrub). I'm not certain of the 'from the americas' bit.
'shrubs from the americas' is the wordplay.
'shrubs' becomes 'erica' (I've seen this before).
'from' is a charade indicator (letters next to each other).
'the americas' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'erica'+'s'='ERICAS'
Can you help me to learn more?
(Other definitions for ericas that I've seen before include "bloomers" , "some low shrubs" .)