Tap on a cask (6)

I believe the answer is:

spigot

'tap on a cask' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for spigot that I've seen before include "Peg to control the flow of a tap" , "Tap - stopper" , "Peg for a cask's vent" , "Tap for barrel" , "Vent hole peg - US tap" .)

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

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