Singer of a lot of rock, as well as Gershwin (7)

I believe the answer is:

shakira

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'singer' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'lot of rock as well as gershwin' is the wordplay.
'lot of' means to remove the last letter (a lot of the word but not all of it).
'rock' becomes 'shake' (synonyms).
'as well as' is a charade indicator (letters next to each other).
'gershwin' becomes 'ira' (lyricist Ira Gershwin, brother of George).
'shake' with its last letter taken off is 'shak'.
'shak'+'ira'='SHAKIRA'

'of a' acts as a link.

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I've seen this clue in The Guardian.

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