37a old world songbird with a black plumage and reddish breast (9)
--o-e----
20d latin phrase meaning 'pray and work' (3,2,6)
o--/e-/l--o--
21d sailing or motored vessels with twin hulls held parallel by a rigid frame(10)
sa-ama-a--
22d a hard greyish black mineral used as an abrasive and polishing agent(5)
t-e-y