Crossword Genius

Element unknown in Cape (4)

Ross

I believe the answer is:

zinc

'element' is the definition.
(zinc is a kind of element)

'unknown in cape' is the wordplay.
'unknown' becomes 'z' (algebra).
'cape' becomes 'c' (abbreviation used on maps).
'z'+'in'+'c'='ZINC'

(Other definitions for zinc that I've seen before include "Blue-white metallic element, atomic number 30" , "White metallic element usedin alloys" , "Constituent of brass" , "White metallic element used in alloys" , "it might be galvanising" .)

I've seen this clue in The Telegraph.
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