Orchestra member a shipwreck member (5)

I believe the answer is:

viola

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But I can't explain it at all! Could you help me understand?

(Other definitions for viola that I've seen before include "Shakespeare heroine; instrument" , "Twelfth Night heroine" , "Page" , "Sebastian's sister" , "one used to bowing?" .)

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

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