A little waterfall? (8)

I believe the answer is:

teardrop

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'a little waterfall?' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

This is the entire clue.

Can you help me to learn more?

(Other definitions for teardrop that I've seen before include "One shed from eye" , "one running away from viewer" , "spot of grief" , "pearl" , "Visible result of crying" .)

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