Crossword Genius

His money may be well-earned (7)

Ross

I believe the answer is:

driller

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'his money may be well-earned' is the definition.
The definition suggests a singular noun which matches the answer.

This is all the clue.

Can you help me to learn more?

(Another definition for driller that I've seen is " Borer".)

I've seen this clue in The Irish News and The Globe and Mail.
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