They report what's happening in front of The Hill to referee (8)

I believe the answer is:

mediator

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'referee' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for mediator that I've seen before include "One intervening to settle a dispute" , "referee" , "Negotiator between opposing parties" , "peacemaker" , "Kind of arbitrator - one to admire" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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