Somewhere in Liverpool, puzzling remains ... (6,3)

I believe the answer is:

knotty ash

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'somewhere in liverpool' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'puzzling remains' is the wordplay.
'puzzling' becomes 'knotty' (I've seen this before).
'remains' becomes 'ash' (remains of a fire).
'knotty'+'ash'='KNOTTY ASH'

Can you help me to learn more?

I've seen this clue in The Independent.

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