1) Two guys overlooking first-class collector's items (10) ?I?T?R?A?A
2) Out of skirts, most excellent Spanish lady? (4) ?N?S
3) Mercedes skid: team's on the edge (4-4) S?D?- S?I? It's obviously SIDE-SLIP as that accounts for "skid: team's on the edge", but what on earth has Mercedes got to do with it?