Crossword Genius

Setter’s well? (4)

Ross

I believe the answer is:

mine

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'setter's' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'well?' is the second definition.
(thesaurus)

Can you help me to learn more?

(Other definitions for mine that I've seen before include "Types of war vessels" , "An abundant source, as of gold" , "Pit; explosive device" , "Excavation in the earth for digging coal etc" , "Store" .)

I've seen this clue in The Independent.
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