Bird and bat droppings used as fertiliser (5)

I believe the answer is:

guano

(Other definitions for guano that I've seen before include "Fertiliser (either from bird droppings or artificial)" , "Fertiliser from seabirds" , "Seabird excrement, once prized as fertiliser" , "type of fertiliser" , "Touching month turning over" .)

I've seen this clue in The Guardian.

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