Sole place with substantial surplus? (5)
I believe the answer is:
dover
'sole place' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'substantial surplus?' is the wordplay.
'substantial' becomes 'd' (I can't justify this - if you can you should believe this answer much more).
'surplus?' becomes 'over' (I've seen this before).
'd'+'over'='DOVER'
'with' acts as a 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" .)