Might be the alcohol content (8)

I believe the answer is:

strength

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'might' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for strength that I've seen before include "The longest one-syllable word in English - might" , "stamina" , "Force, might, potency" , "Force, firmness" , "Physical energy" .)

I've seen this clue in The Globe and Mail.

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