Sunday Post Cryptic
1a,lettuce,nearly the greatest in the world,?o?e??
4d,such a defender sent off for gleeful gloating,?????????????
12a,iris on the vessel,?l????
15d,no wealthy wife entered county town,n??????
20a,rule out a note in an introductory piece,???????e
21a,one who inherits helium and iridium,????