Continental river flowing through Kilmarnock? (4)

I believe the answer is:

arno

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'continental river' is the definition.
'arno' can be an answer for 'river' (Italian river). I'm not certain of the 'continental' bit.

'flowing through kilmarnock?' is the wordplay.
'ARNO' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for arno that I've seen before include "Florence's river" , "River flowing through Florence and Pisa" , "River of 11 across" , "Pisa's river" , "Banker" .)

I've seen this clue in The Irish Times.

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