A piece from Grieg or Bach evoking an instrumental figure (9)

I believe the answer is:

gorbachev

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'an instrumental figure' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'a piece from grieg or bach evoking' is the wordplay.
'a piece from' says the answer is hidden in the clue.
'GORBACHEV' can be found hidden inside 'grieg or bach evoking'.

Can you help me to learn more?

(Another definition for gorbachev that I've seen is " Famous Russian".)

I've seen this clue in The Telegraph.

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