Cryptic crossword No 3,700

Across

1. Older than 100, he wrote about shifting the range of policies acceptable to the public (7)
2. Italian votes against in phone company AGM, taking the second item and presenting it first (7)
3. Ship lot or supply clothing (4,5)
4. First lady bound to hold number that may contain a letter (8)
5. College men are recumbent cycling (5)
6. Eurovision singer Janet takes part (5)
7. Coors strangely invested in notepaper brand (9)
8. The French crossword magazine promotion (6)
9. Design trips abroad that happen twice a month (6,5)
10. Start to shiver, mercury about zero, very quiet at home - turning in (8)
11. Republican Four included in article prosper (6)
12. Sea creature in timeless seaside town getting tail docked surrounded by reproachful outsiders (7)
13. Junk fuel cells regularly discarded by electronic instrument (7)

Down

1. Exercise including part of Anthem: "That's how the light gets in" (4)
2. Copper crashes about in the end (8)
3. Gangster with penchant initially for Tyneside area and love for a Bacardi Breezer? (7)
4. Poorly eagle? (5,3)
5. Ambassador, sister and IT executive (6)
6. Feeling happy about Nationalist switch leading to becoming a member again (9)
7. Less wise Aragorn getting up for king (8)
8. Wear away part of a guitar (4)
9. American castrated sheep outside to get through it unscathed (7)
10. Government person who is obsessive about satellite returning vinaigrette? (8)
11. Foxtrot rather than tango in wartime location like Joséphine Baker (6)
12. They log on after work for study of cultures (9)
13. Charlie gets thinner daily (7)
14. Without question feels uncomfortable shifting one to the right and initially embarrassed to draw a conclusion (7)
15. Ridicule tsar's guards that protect a knight's backside (6)
16. Musical old organ (6)