I don't think I've ever heard of Macy's having on-call for cosmetics... the cosmetic lines usually have artists and other on call employees they will send to stores during gala's and gifts. But it might be something new with Macy's seeing as they've been cutting and eliminating positions... we only have 1 full and 1 part timer in our fragrance dept now so who know how they will handle the Holidays?
Did you do Talent Plus with someone from Clinique? If not, you will definately just be working with Macy's in general and I'm betting will be filling in during Fall Gala, gifts and the Holidays as a ringer/runner. But definately ask HR to find out for sure. It could be a step up to a permanent position with one of the lines if they like what they see
Congrats on the new job in any case!