Crossword Genius

Unknown individual where war is being fought? (4)

Ross

I believe the answer is:

zone

'where war is being fought?' is the definition.
(warzone)

'unknown individual' is the wordplay.
'unknown' becomes 'z' (algebra).
'individual' becomes 'one' (an individual is one person).
'z'+'one'='ZONE'

(Other definitions for zone that I've seen before include "Area subject to restrictions, parking say" , "Particular area or sector" , "Area with particular characteristics" , "A defined area as for particular purpose" , "Region; time area" .)

I've seen this clue in The Times.
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