Crossword Genius

Crumbly deposit (4)

Ross

I believe the answer is:

marl

'crumbly deposit' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for marl that I've seen before include "Clayey fertiliser" , "Clay/silt fertiliser" , "Type of clay used as fertilizer" , "Clayey rock or soil" .)

I've seen this clue in the Penny Press.
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