Loving sign off stock brand? (3)

I believe the answer is:

oxo

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'stock brand?' is the definition.
'oxo' can be an answer for 'stock' (stock for cooking can be made from Oxo cubes). I am not certain of the 'brand?' bit.

I don't 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 "Proprietary brand of beef cube" , "Stock cube brand" .)

I've seen this clue in the Sydney Morning Herald.

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