Crossword Genius

What might measure the spirit of a viewer (5)

Ross

I believe the answer is:

optic

I believe this is a double definition.

'what might measure the spirit' is the first definition.
(an optic is used to measure alcoholic spirits)

'of a viewer' is the second definition.
(relating to eyes - things that view)

(Other definitions for optic that I've seen before include "Spirits dispenser" , "bar assistant" , "Describing a sensory organ" , "Device for measuring dispensed alcohol" , "Ocular" .)

I've seen this clue in The Telegraph.
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