Leave droppings (4)

I believe the answer is:

scat

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This could be a double definition.

'leave' is the first definition.
(I've seen this before)

'droppings' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

Can you help me to learn more?

(Other definitions for scat that I've seen before include "Wordless singing style" , ""Beat It"" , "it's dropped by 21 [SNAKES]" , "Style of jazz singing" , "vocal style?" .)

I've seen this clue in The Telegraph.

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