Crossword Genius

Slowly made cage, lion continually the focus (6)

Ross

I believe the answer is:

adagio

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'slowly' is the definition.
(I've seen this in another clue)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for adagio that I've seen before include "(Piece to be played) slowly" , "'Slowly and gracefully, in music (6)'" , "Slow and graceful, musically" , "moving slowly" , "Musically, in slow time" .)

I've seen this clue in The Telegraph.
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