Crossword Genius

Stone cooking system is unusual (7)

Ross

I believe the answer is:

strange

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'unusual' is the definition.
(I know that unusual can be written as strange)

'stone cooking system' is the wordplay.
'stone' becomes 'st' (abbreviation).
'cooking system' becomes 'range' (I can't explain this - if you can you should believe this answer much more).
'st'+'range'='STRANGE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for strange that I've seen before include "Unusual, odd" , "Peculiar; Morse's boss" , "Eccentric" , "- - Fruit (song)" , "Odd or unknown" .)

I've seen this clue in The Independent.
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