What is another word for "clench"?

Roget's Thesaurus (1911) lists these synonyms for "clench": agent, agree, agreement, and, attest, back, bargain, barter, bird, bond, candle, captive, cartel, caveat, charter, clinch, close, clutch, come, compact, complete, completion, compromise, conclude, concordat, confirm, contract, convention, conventional, covenant, custody, deal, detain, detention, diplomacy, endorse, engage, entail, fast, favored.