She means a bit of heaven to the Americans (5)
I believe the answer is:
venus
'she' is the definition.
'a bit of heaven to the americans' is the wordplay.
'a bit of heaven' becomes 'ven' (I can't justify this - if you can you should believe this answer much more).
'to the americans' becomes 'US' (United States).
'ven'+'us'='VENUS'
'means' acts as a link.
Can you help me to learn more?
(Other definitions for venus that I've seen before include "Next planet in" , "Roman counterpart of Aphrodite" , "Planet; goddess" , "Aggrieved, peeved" , "Roman goddess of love" .)