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Monster, one in northerly German city (6)

Ross

I believe the answer is:

nessie

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'monster' is the definition.
(Nessie is an example)

I don't understand how the rest of the clue works.

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(Other definitions for nessie that I've seen before include "Scots loch monster (colloq.)" , "Nickname for a Scottish monster" , "Supposed loch monster" .)

I've seen this clue in The Guardian.
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