I've no meaning three either for 24ac,but my Chambers is very old - a revised edition with supplement, latest impression 1968. Despite its dilapidated state I like to keep it as it was a birthday present from my mother in 1969 when I was 20.
Despite the absence of a 3rd meaning, I vaguely recalled the strike meaning.
Thanks for help with 22d. This leaves me with only 20 ac -Flagship bearing right? I have ?t?e?m?r. I can only see one answer, but can't see why it means Flagship (for which there is no definition in my Chambers). Any suggestions?