Excellent duke back to home land (5)
I believe the answer is:
india
'land' is the definition.
(India is an example)
'excellent duke back to home' is the wordplay.
'excellent' becomes 'ai' (resembles 'A1', old-fashioned term for excellent).
'duke' becomes 'd' (abbreviation).
'back' is a reversal indicator.
'to' means one lot of letters go next to another (I've seen this in other clues).
'home' becomes 'in' ('he's home' can mean 'he's in').
'ai'+'d'='aid'
'aid' back-to-front is 'dia'.
'dia' put after 'in' is 'INDIA'.
(Other definitions for india that I've seen before include "Country: I (comms.)" , "Country of Gandhi" , "Commonwealth country, independent in 1947" , "Commonwealth state" , "Second-most populous country" .)