Miner's strike in Korea? (3)

I believe the answer is:

ore

'miner's strike' is the definition.
(I've seen this in another clue)

'in korea?' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ORE' is hidden within 'korea'.

(Other definitions for ore that I've seen before include "14 [CURRENCY UNIT]" , "Foreign currency" , "It's mined for minerals" , "Raw material" , "Valuable resource" .)

I've seen this clue in The Times.

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