Genghis Khan was one second before 12 noon and a little lunch (6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

MO (second) before GO between (12ac) N (noon) and L (first letter or ‘a little’ of lunch). A rather devious device here which had us head-scratching. You have to lift and separate the answer to 12ac.