Labour perhaps deletes information from correspondence (5)

I believe the answer is:

party

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'labour' is the definition.
(the Labour Party is an example)

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

(Other definitions for party that I've seen before include "Political organisation" , "Political group - celebration" , "Political group; function" , "Social gathering; person" , "Celebratory social gathering" .)

I've seen this clue in The Irish Times.

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