Cryptic crossword No 3,940

Across

1. A polar bear oddly jumping making plane curve (8)
2. Gang of thieves, say, with hollow crook following old man (4)
3. Currently active in theatre work (2,4)
4. From the midfield, Gunners win games in sweep (5)
5. Note mistake wasting energy in match (6)
6. Burden of love breaking chap (4)
7. Capacity from Palermo orchard doubling (4)
8. Car in essentially new condition (6)
9. Specialty of fellow principally in English literature department (5)
10. Fighters from Britain not prepared, the French rule with first in show (8)
11. Pound of root vegetable gathered (4)
12. Celebration headed for opening (4)
13. Increase muscle after key athletic endeavour primarily (8)
14. Snake on road getting food (5)
15. Pure tenor periodically performing in a cluster of countries (6)
16. All-inclusive host not stumped by schedule given current clubs (8)
17. Wheeling cart in garden? (4)

Down

1. Marketplace fantastic according to rumour (6)
2. Charge in battle, first to die (4)
3. American lawyer cleared trustee in court (4)
4. Station falls to pieces in some measure (4)
5. Restaurant server dropping iodine in basic drink (5)
6. Desperately plead to go by bike perhaps (5)
7. Embrace cryptic clue cracked by religious scholar (6)
8. Long for a revolutionary leader (4)
9. Beverage business with focus of uniform price (6)
10. Putting your oar in sea with dead fish (8)
11. Tom overwhelmed by stormy coast with short and sharp sounds (8)
12. First pair in slalom float without resistance and move smoothly (5)
13. Conclusion from institute breaking two records, topping university expectations originally (8)
14. Harlot, for one, starts to solicit customer with condom (8)
15. Tour on vacation heralding old photo showing a line around the Earth (6)
16. Give up drugs but not ecstasy, accepting an element of risk (4)
17. Support the ultimate in soccer, Irish footballer topless! (4)