Enumerate all of the legal clues that Alice can give.
Of these possibilities, what clue should Alice give?
Alice can clue green to Cathy as a Play Clue on the green 3.
Alice can clue number 5 to Cathy as a 5 Save on the red 5.
It makes more sense for Alice to give the Play Clue instead of the Save Clue, since Cathy won't be discarding anything on her turn if she is preoccupied with playing a card.