Over DiCaprio stopping affair later (8)

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

(O{ver} and Leo(=Leonardo DiCaprio)) inside(="stopping") to-do(=affair). The two contained words are in different places, which is a little unusual, although I can't see why it wouldn't be valid. The def is just later when you used as a way of saying goodbye – instead of "see you later" people just say "later".