Crossword Genius

Verification of alcohol strength (5)

Ross

I believe the answer is:

proof

This clue is a double definition.

'verification' is the first definition.
(thesaurus)

'alcohol strength' is the second definition.
(I've seen this before)

'of' acts as a link.

(Other definitions for proof that I've seen before include "Evidence that establishes the truth" , "Exposition ending QED?" , "Conclusive evidence or verification" , "Decisive evidence" , "to give a watertight case?" .)

I've seen this clue in The Mirror.
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