Sole place with substantial surplus? (5)
I believe the answer is:
dover
'sole place' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'substantial surplus?' is the wordplay.
'substantial' becomes 'd' (I am not sure about this - if you are sure you should believe this answer much more).
'surplus?' becomes 'over' (I've seen this before).
'd'+'over'='DOVER'
'with' is the link.
Can you help me to learn more?
(Other definitions for dover that I've seen before include "fish" , "Kent ferry port" , "Roved around the English port" , "There'll be blue clouds over the white cliffs here" , "Cinque Port" .)