Crossword Genius

Where there was coal stack in a barn (4)

Ross

I believe the answer is:

goaf

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'where there was coal stack in a barn' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Another definition for goaf that I've seen is " Rick".)

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