Benjamin’s keen grasp of Euro capital (5)

I believe the answer is:

minsk

I'm a little stuck... Click here to teach me more about this clue!

'euro capital' is the definition.
'Minsk' can be an answer for 'capital' (capital of Belarus). I'm not certain of the 'euro' bit.

'benjamin's keen grasp' is the wordplay.
'grasp' says the answer is hidden in the clue (I've seen 'grasps' mean this).
'MINSK' is hidden within 'benjamins keen'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for minsk that I've seen before include "E European capital" , "Capital of Belarus" , "City of Belarus" , "Capital of 15" , "Russian city" .)

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

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