Star Seeker

Across: 1 Indefensible; 7 Motor; 8 Extra; 9 Rot; 10 Ceaseless; 11 Inform; 12 Random; 15 Imprudent; 17 Urn; 18 Leave; 19 Exact; 21 Restlessness. Down: 1 Incorrigible; 2 Fit; 3 Normal; 4 Inelegant; 5 Lathe; 6 Parsimonious; 7 Motif; 10 Corpulent; 13 Doubt; 14 Delete; 16 Peace; 20 Ass. Star Name: PHIL COLLINS