Manufacturer of stock line of game that's inconclusive (3)

I believe the answer is:

oxo

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

'line of game that's inconclusive' is the wordplay.
'line of' becomes 'ox' (I am not sure about this - if you are sure you should believe this answer much more).
'game' becomes 'on' (both can mean willing).
'that's inconclusive' means to remove the last letter.
'on' with its final letter removed is 'o'.
'ox'+'o'='OXO'

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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