Unrivalled description of House of Lords when empty? (8)
I believe the answer is:
peerless
'unrivalled' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for peerless that I've seen before include "Unequalled" , "Without equal or match" , "Having no equals" , "Outstanding" , "Without equal, nonpareil" .)