Crossword Genius

Big arena to get continuously repeated musical phrase (8)

Ross

I believe the answer is:

ostinato

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'repeated musical phrase' is the definition.
(I've seen this in another clue)

'big arena to' is the wordplay.
'big' becomes 'os'.
'arena' becomes 'tina' (I can't justify this - if you can you should believe this answer much more).
'os'+'tina'+'to'='OSTINATO'

'get continuously' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for ostinato that I've seen before include "Ground-bass (mus.)" , "Persistent rhythm" , "Continually repeated musical phrase/rhythm" , "Repetitive 1 Down" , "Ground" .)

I've seen this clue in the Sydney Morning Herald.
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