It's "aftershave lotion". But I must have something terribly wrong elsewhere as I am really stuck:
21a: b?t?n?/s?i? (potential source of slip-up 6,4)
42d: ?a?s/?r?? (deep instrument 4,4)
56A: l???n/?h?e?e (conserve 5,6)
As for 42down, I can't even think what "deep instrument" means! Can anyone please help?