Crossword Genius

Gymnast that can be found on a bar? (7)

Ross

I believe the answer is:

tumbler

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'gymnast' is the definition.
(tumbler is a kind of gymnast)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tumbler that I've seen before include "might be full of drink" , "Constantly dropping" , "Stemless straight-sided glass" , "One flips" , "Machine for drying" .)

I've seen this clue in The Independent.
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