noun

a person who buys and sells goods or assets for others.

the centralized lenders operate through brokers

dealer,broker-dealer,agent,negotiator,trafficker,middleman,intermediary,mediator,factor,trustee,liaison,representative,go-between,stockbroker,insurance broker,interdealer broker,rep,scrivener

verb

arrange or negotiate (an agreement).

fighting continued despite attempts to broker a ceasefire

arrange,organize,orchestrate,work out,thrash out,hammer out,settle,clinch,contract,pull off,bring off/about,negotiate,mediate,arbitrate,act as go-between,sort out,swing