Roar from Norway rat in a type of port (5)

I believe the answer is:

tawny

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'port' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for tawny that I've seen before include "Orange-brown in colour" , "Brownish-yellow" , "Golden brown" , "port" , "Yellowish-brown - kind of owl" .)

I've seen this clue in The Irish Times.

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