Crossword Genius

Watercourse in the Skerries (3)

Ross

I believe the answer is:

esk

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'watercourse' is the definition.
I know nothing about this answer so I can't judge whether this works.

'in the skerries' is the wordplay.
'in' indicates a hidden word.
'ESK' is hidden within 'the skerries'.

Can you help me to learn more?

(Other definitions for esk that I've seen before include "Scottish river" , "Northern river" , "River in the Borders" , "River flowing into Solway Firth" , "River in Dumfries" .)

I've seen this clue in The Independent.
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