2: The pole will carry the principal mainsail (5)
3: Embedded work in the French part of Yemen (5)
4: Beauty stripping top and bottom is an additional feature (3)
5: Think at length about lost planet, comet (11)
6: Makes a killing in Massachusetts land holdings (9)
7: Sound of river crossing (3)
8: Forms of robbery involving hoisted flags (4-5)
10: Artists workshop E. Lear bowled over with it (7)
12: Mere chance of depression interrupting peace (11)
13: Praised a general capturing returning traitors (9)
14: Break down door with your visitor to Oz (7)
15: Unimportant Emma? Still upset? (5,4)
18: Turning up to follow bashful rodent (5)
19: Material driving essential, we hear (5)
20: Call for help oddly stops (3)
21: First get a French weapon. (3)