Crossword Genius

Violinist's big sister? (5)

Ross

I believe the answer is:

viola

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'violinist's' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'big sister?' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

Can you help me to learn more?

(Other definitions for viola that I've seen before include "Alto of the violin family" , "String instrument of a range between the violin and cello" , "String quartet member" , "Page" , "Bloomer" .)

I've seen this clue in the Evening Standard.
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