Crossword Genius

Unrivalled like the Commons? (8)

Ross

I believe the answer is:

peerless

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'unrivalled' is the definition.
(synonyms)

I don't understand how the rest of the clue works.

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(Other definitions for peerless that I've seen before include "superb" , "No Iolanthe performance could be so" , "Without equal, being without a lord?" , "Without equal, matchless" , "Excellent" .)

I've seen this clue in The Sun.
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