3 interconnected clues:
5D This provides some understanding for one who
moves on the ice (7) S _ E _ P _ _ (sweeper?)
6D Chiefs of computer sections are only nominally
in charge (6-5) _ I S _ R _ / _ _ A _ S (Heads?)
15A He goes for the gold (6) _ _ _ _ _ R
If Sweeper and Heads are correct _ R _ H _ R
Archer?
For the second time today - thanks a million, Mamya.
So , my 9A giving me the "S" in 6D is wrong.
I think the answer is Cracking, where I had Crackers.
But it knocks out Sweeper as the answer to 5D,
which is now S _ I _ P _ R