Crossword Genius

Young swimmer left drops in bar (5)

Ross

I believe the answer is:

elver

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'young swimmer' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for elver that I've seen before include "Immature fish" , "A young 11" , "New slipper" , "Young, migrating eel" , "One may see one upriver" .)

I've seen this clue in The Independent.
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