Crossword Genius

Device legally required for serving gin, rum, vodka and whisky in UK pubs since 1963 (5)

Ross

I believe the answer is:

optic

(Other definitions for optic that I've seen before include "Spirits measurer" , "What could measure the spirits" , "Ocular" , "Teacher's maybe dispensed with this" , "Pub measure" .)

I've seen this clue in The Sunday Times and The Times.
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