Cryptic crossword No 3,719

Across

1. Requirement to take exercise in retirement is lower (6)
2. West Ham are transformed into football’s numero unos??  It’s a hypothetical question! (4,2)
3. Pornographic books seen in Morecambe?  (6)
4. A man in European country or a female in Greek mythology  (8)
5. Finally Murray exposed Nadal - and again! And so on! (4,4)
6. Reinforcement of pots (8)
7. Humble duke agreed to dance  (7)
8. What's behind Joe Root's pants?! They're bulging! (6)
9. Noon in summer in St Tropez and finally temperature’s beginning to nudge close to 20  (8)
10. Nameless informer enters Scotland Yard - a good place to do some "shopping" (6)
11. Hoover etc to freshen up berth on “Queen Elizabeth”  (7)
12. Publisher, bored by writer/journalist, revealed true feelings (6,2)
13. After appeal, bankrupt business finally folds (6)
14. Five hundred thousand crammed into old county town to see monument (8)

Down

1. Is Today Programme's first broadcast a nightmarish vision of the future? (8)
2. Foot cut in pit becomes blue (10)
3. Extras in "Aristocrats" receive a couple of lines (2,5)
4. Finally Germaine Greer’s about to accept the majority of men – come again!?  (8)
5. Big tech company with time to create small programme (6)
6. A small island in Scotland and in Switzerland  (4)
7. Slowly a soldier gets into trouble (6)
8. Disney character making a comeback among Italian kids (7)
9. Indian sailor confuses port and starboard – naughty boy!   (6)
10. Unusual routes for dismissal from office Stateside (6)
11. Opera including naked version of "Martha" seen in old county town (10)
12. Bloody wife finally turned on me - a guardian is required! (8)
13. Bad stage to form a scab  (8)
14. Jersey, perhaps with large hood (4)