Crossword Genius

Stone-working axes (4)

Ross

I believe the answer is:

onyx

'stone' is the definition.
(type of gemstone)

'working axes' is the wordplay.
'working' becomes 'on' (on can mean working or activated).
'axes' becomes 'yx' (Y axis and X axis).
'on'+'yx'='ONYX'

(Other definitions for onyx that I've seen before include "Form of agate" , "Gemstone, a variety of chalcedony" , "Black and white striped gemstone" , "Banded gemstone" , "Sort of agate" .)

I've seen this clue in The Independent.
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