Old duchess and American greeting earl outside grounds (7)
I believe the answer is:
yolande
'old duchess' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'american greeting earl outside grounds' is the wordplay.
'american greeting' becomes 'yo' (greeting in US English).
'earl' becomes 'e'.
'outside' means one lot of letters goes inside another (some letters go outside others).
'grounds' becomes 'land'.
'yo'+'e'='yoe'
'yoe' placed around 'land' is 'YOLANDE'.
'and' is the link.
Can you help me to learn more?
(Another definition for yolande that I've seen is " her around".)