Go into rate changes with broker (10)
I believe the answer is:
negotiator
'broker' is the definition.
(thesaurus)
'go into rate changes' is the wordplay.
'changes' indicates anagramming the letters.
'go'+'into'+'rate'='gointorate'
'gointorate' anagrammed gives 'NEGOTIATOR'.
'with' is the link.
(Other definitions for negotiator that I've seen before include "One trying to agree a compromise" , "Bargaining type" , "Seeker of compromise" , "One in discussions to reach an agreement" , "One may circumvent obstacles" .)