Small cask for butter or fish (6)

I believe the answer is:

firkin

(Other definitions for firkin that I've seen before include "Nine-gallon wooden keg" , "Wooden keg with 9 imperial gallons" , "Small wooden barrel - nine gallons" , "Brewing measure equal to 9 gallons" , "Small cask for liquids, butter, fish" .)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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