When performing lions visit, they may take a bow (10)

I believe the answer is:

violinists

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'when performing' is the definition.
I can't judge whether this defines the answer.

'lions visit they may take a bow' is the wordplay.
'lions visit' anagrams to 'VIOLINISTS'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

I've seen this clue in The Independent.

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