Crossword Genius

British unit of capacity equal to nine gallons (6)

Ross

I believe the answer is:

firkin

(Other definitions for firkin that I've seen before include "Brewing measure of nine gallons" , "Small cask formerly used for liquids" , "Nine-gallon wooden keg" , "Cooper's little effort" , "Brewing measure equal to 9 gallons" .)

I've seen this clue in The Mirror.
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