Crossword Genius

Copper pen in 3-D (5)

Ross

I believe the answer is:

cubic

'3-d' is the definition.
(I've seen this in another clue)

'copper pen' is the wordplay.
'copper' becomes 'Cu' (chemical symbol).
'pen' becomes 'bic' (pen manufacturer).
'cu'+'bic'='CUBIC'

'in' is the link.

(Other definitions for cubic that I've seen before include "puzzling sort of equation" , "With six equal faces" , "Of the third power (mathematically)" , "Like sugar lumps" , "The first C in cc" .)

I've seen this clue in The Telegraph.
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