Sandy, Broadway composer, leaving diamonds for dancer (6,6)

I believe the answer is:

ginger rogers

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'dancer' is the definition.
(I know that Ginger Rogers is a dancer)

'sandy broadway composer' is the wordplay.
'sandy' becomes 'ginger' (hair colour).
'broadway composer' becomes 'rogers' (I can't explain this - if you can you should believe this answer much more).
'ginger'+'rogers'='GINGER ROGERS'

'leaving diamonds for' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Another definition for ginger rogers that I've seen is " Fred Astaire's dancing partner".)

I've seen this clue in The Times.

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