European capital to turn sharply on bishop (6)

I believe the answer is:

zagreb

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'european capital' is the definition.
(capital of Croatia)

'turn sharply on bishop' is the wordplay.
'turn sharply' becomes 'zag' (I can't justify this - if you can you should believe this answer much more).
'on' becomes 're' ('on' can be mean 'with reference to').
'bishop' becomes 'b' (abbreviation used in chess).
'zag'+'re'+'b'='ZAGREB'

'to' is the link.

Can you help me to learn more?

(Other definitions for zagreb that I've seen before include "Croatia's capital city" , "Capital city of Croatia" , "Croatian city" , "Croatian capital" , "on River Sava" .)

I've seen this clue in the Sydney Morning Herald.

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