Show up a House of Lords member, reportedly (6)

I believe the answer is:

appear

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'show up' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for appear that I've seen before include "Turn up" , "Materialise like ghost" , "Look - materialise" , "Arrive" , "Seem or materialise" .)

I've seen this clue in The Telegraph.

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