Ambassador absorbed by finale in Port Vale's old ground (3,4)

'old ground' is the definition.
The definition and answer can be both natural objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'ambassador absorbed by finale in port vale's' is the wordplay.
'ambassador' becomes 'HE' (His or Her Excellency).
'absorbed by' means one lot of letters goes inside another.
'finale in' says to take the final letters (the final letter).
'vale' becomes 'dell' (dell is a kind of vale).
The final letter of 'port' is 't'.
't'+'dell'='tdell'
'he' put within 'tdell' is 'THE DELL'.

Can you help me to learn more?