Originality of points, three of them in all (7)

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

I’ve had a blind spot here: we have all four compass points, three of them twice, but I can’t see quite how the clue works Edit – thanks to KVa @1 Points, three of them (3 points)=N E S in All (all 4 points) N E W S