1: Bachelorettes wear indecent clothing to induce one to take a vow (5, 2)
2: Note vehicle in picture puzzle (5)
3: A date in February: good time for a massacre? (10,3)
4: Zantac's first in things to buy for composer (5)
5: Introduction of inert ions with mercurial elements (9)
6: Certainly not breaking many bones (2,2,5)
7: He was called to defend complicated Fed rate (7)
9: Cheaper oil, gas distributed in Island chains (13)
12: Pasta leads to eccentric crime boss losing head (9)
14: Formative years of Julia and Robin (9)
15: She plays in a small enclosure on one street (7)
16: Deviated before getting cast out (7)
19: Horse bolted as 7 lost its way (5)
20: Very loud intrusion spoiled its cross words (5)