Crossword Genius

They make cubes - but nothing's squared? (3)

Ross

I believe the answer is:

oxo

I'm a little stuck... Click here to teach me more about this clue!

'they make cubes' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'nothing's squared?' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'squared?' becomes 'xo' (I am not sure about this - if you are sure you should believe this answer much more).
'o'+'xo'='OXO'

'but' acts as a link.

Can you help me to learn more?

(Other definitions for oxo that I've seen before include "Stock cube brand" , "Proprietary brand of beef cube" .)

I've seen this clue in The Independent.
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