Crossword Genius

Vocally opposed stronghold (4)

Ross

I believe the answer is:

fort

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'stronghold' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for fort that I've seen before include "Strategic position" , "Defensive building" , "US gold reserves are at - Knox" , "Keep" , "William in Scotland" .)

I've seen this clue in the Sydney Morning Herald.
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