Crossword Genius

Social media company invested in O 2 stock (3)

Ross

I believe the answer is:

oxo

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

'stock' is the definition.
(stock for cooking can be made from Oxo cubes)

I cannot understand how the remainder of the clue works.

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" .)

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