All down answers are the names of famous sportsmen or actors. The problem is that each clue contains more information than just these names! I won't say any more as it would spoil the 'fun' for yourself and anyone else who happened to look in here. Have a go on that basis.
I've only one clue left -- supposedly one of the easier across ones !
Animal finding currency in quarter (5) _Y_N_
Hyena leaps out, with yen in the centre, but what about the "ha" for quarter ? (The only other animal that fits is a kyang but doesn't go with the clue !)
That's a bit devious pjw, but thank you nonetheless.
It took a little while for the penny to drop in this one, and, not being into football took ages to get 2 dn !