Outspoken nobleman spars with music players (9)

I believe the answer is:

jukeboxes

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'music players' is the definition.
Although both the answer and definition are plural nouns, I don't see how one could define the other.

'outspoken nobleman spars' is the wordplay.
'outspoken nobleman' becomes 'juke' (I am not sure about this - if you are sure you should believe this answer much more).
'spars' becomes 'boxes' (I've seen this in another clue).
'juke'+'boxes'='JUKEBOXES'

'with' acts as a link.

Can you help me to learn more?

(Other definitions for jukeboxes that I've seen before include "Where landlords keep their records" , "More than one music maker" .)

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

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