Possible Clues:

• It's not easy for those at the end of 24 across opposing the peacemakers
• Fanatic had ship crossing river
• One committed to an uncompromising policy
• Difficult part of speech, right, for politician
• Mate of Nelson docked ship, one that's kept on course?
• In time, Ireland abandoned uncompromising leader
• Frozen type similar to one of those at the end of 11 down can't be budged in a manner of speaking
• Uncompromising advocate
• Political hawk not soft on phone to rebel leader
• Person following rigid policy in firm over cosmetic