TOKYO — The U.S. dollar clung to small gains on Tuesday as caution reigned in currency markets, ahead of major central bank meetings. The meeting begins with a two-day Federal Reserve gathering due to start later in the global day. The greenback hovered just off its highest since June versus the yen and cemented a position around $1.19 per euro in muted trading. The firmer tone for the dollar came despite a retreat in U.S....










