Crossword Genius

Stronghold strikes heard over store of gold (4,4)

Ross

I believe the answer is:

fort knox

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'store of gold' is the definition.
The definition suggests a singular noun which matches the answer.

'stronghold strikes heard' is the wordplay.
'stronghold' becomes 'fort' (I've seen this in another clue).
'strikes' becomes 'knocks' (knocking is a kind of striking).
'heard' shows a homophone (sound like).
'knocks' is a homophone of 'knox'.
'fort'+'knox'='FORT KNOX'

'over' acts as a link.

Can you help me to learn more?

(Other definitions for fort knox that I've seen before include "Site of the US Gold Bullion Depository" , "American military reservation which holds the nation's gold bullion" , "Military reservation in Kentucky which guards America's gold" , "Location of US gold depository" , "Secure location" .)

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