To admire an umpire (8)

I believe the answer is:

mediator

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'umpire' is the definition.
(thesaurus)

'to admire an' is the wordplay.
'to admire' can be anagrammed to 'MEDIATOR'.
But, I'm not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for mediator that I've seen before include "Negotiator between opposing parties" , "referee" , "Person working to settle disputes" , "One intervening to settle a dispute" , "peacemaker" .)

I've seen this clue in The Irish News.

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