Crossword Genius

Sole place with substantial surplus? (5)

Ross

I believe the answer is:

dover

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'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" .)

I've seen this clue in the Evening Standard.
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