Crossword Genius

American fellow leaving rough coalfield covered with dust (7)

Ross

I believe the answer is:

collied

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'american' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives sometimes mean the same thing.

I can't explain the remainder of the clue.

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(Another definition for collied that I've seen is " covered with grime".)

I've seen this clue in The Times and The Sunday Times.
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