Stevenson's ________ Silver (4,4)

I believe the answer is:

long john

'stevenson's silver' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for long john that I've seen before include "Pirate in 12 2" , "Villain in 7 6" .)

I've seen this clue in the Penny Press.

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