Right, America is ready for apple (6)
I believe the answer is:
russet
'apple' is the definition.
(a russet-coloured apple)
'right america is ready' is the wordplay.
'right' becomes 'r' (common abbreviation).
'america' becomes 'US' (United States).
'is ready' becomes 'set' (set can mean ready or prepared).
'r'+'us'+'set'='RUSSET'
'for' is the link.
(Other definitions for russet that I've seen before include "Autumn red" , "Surest type of colour" , "Brown with a reddish tinge" , "Red/brown; a fabric; an apple" , "Brown; apple variety" .)