Crossword Genius

Film barking dog pen, London (2,6,4)

Ross

I believe the answer is:

on golden pond

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'film barking dog' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'pen london' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'pen' is 'enp' which is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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