Unanimously agreed pound/peso exchange (9)
I believe the answer is:
unopposed
'unanimously agreed' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can sometimes define each other.
'poundpeso exchange' is the wordplay.
'exchange' is an anagram indicator.
'poundpeso' anagrammed gives 'UNOPPOSED'.
Can you help me to learn more?
(Other definitions for unopposed that I've seen before include "without query" , "Without resistance or other contenders" , "Not challenged" , "so carried?" , "Nem con" .)