Crossword Genius

Where an otter is at home in Northolt (4)

Ross

I believe the answer is:

holt

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

'where an otter is at home' is the definition.
The definition suggests a singular noun which matches the answer.

'northolt' is the wordplay.
'HOLT' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for holt that I've seen before include "Otter's den" , "on the Dee south of Chester" , "Otter's lair" , "Otterden" , "Otter's burrow" .)

I've seen this clue in the Evening Standard.
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