Two girls sharing an instrument (6)

I believe the answer is:

joanna

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'sharing an instrument' is the definition.
The definition suggests a singular noun which matches the answer.

'two girls' is the wordplay.
'two girls' means two replacements for 'girl'.
'girl' becomes 'jo' (woman's name).
'girl' becomes 'anna' ().
'jo'+'anna'='JOANNA'

Can you help me to learn more?

(Other definitions for joanna that I've seen before include "Girl's name, piano" , "One's played" , "Piano (rhyming slang)" , "east end piano" .)

I've seen this clue in The Independent.

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