In a way one has to admire a negotiator (8)

I believe the answer is:

mediator

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'a negotiator' is the definition.
(mediator is a kind of negotiator)

'in a way one has to admire' is the wordplay.
'to admire' anagrams to 'MEDIATOR'.
But, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for mediator that I've seen before include "An honest broker" , "Negotiator between opposing parties" , "Go-between, negotiator" , "peacemaker" , "One intervening to settle a dispute" .)

I've seen this clue in The Globe and Mail.

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