...list of names including Independent Party (7)

I believe the answer is:

roister

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'party' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for roister that I've seen before include "Revel noisily, swagger" , "Be boisterous" , "bluster" , "Rioters (anag.)" , "Engage in party activity" .)

I've seen this clue in The Telegraph.

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