Coarse soil by yard (6)

I believe the answer is:

earthy

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'coarse' is the definition.
(synonyms)

'soil by yard' is the wordplay.
'soil' becomes 'earth' (I've seen this before).
'by yard' becomes 'y' (abbreviation. I am not sure about the 'by' bit.).
'earth'+'y'='EARTHY'

Can you help me to learn more?

(Other definitions for earthy that I've seen before include "Coarse or gross" , "Coarse, vulgar" , "Suggestive of soil" , "Blue" , "Unrefined - the ray (anag)" .)

I've seen this clue in The Sun.

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