Gal with rook mistaken, however, for the Sparrow from Minsk (4,6)

I believe the answer is:

olga korbut

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'the sparrow from minsk' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'gal with rook mistaken however' is the wordplay.
'with' is a charade indicator (letters next to each other).
'mistaken' is an anagram indicator.
'however' becomes 'but' (I've seen this in another clue).
'gal' put after 'rook' is 'rookgal'.
'rookgal' is an anagram of 'olgakor'.
'olgakor'+'but'='OLGA KORBUT'

'for' is the link.

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I've seen this clue in The Guardian.

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