Cryptic crossword No 3,487

Across

1. Pipes, somewhat singing, utter SWANSEA!!! (7)
2. Thicko deluxe essentially stupid (7)
3. Grant torques it intermittently (5)
4. These figures express magnitudes (11)
5. Topless Dave going round having sex appeal, producing musical (5)
6. Understand traumatic time and phase (9)
7. Old coin reportedly tax deductible? (7)
8. Aspiring actor's leading role? (8)
9. Craftsman's fancy coffee, perhaps (7)
10. Overperform with rhythm instrument in a Kia Sportage, for example? (8)
11. Confusingly ran pigpen for French rugby team (9)
12. Woman not the first caught delivering message (5)
13. Land of dragons as the inhabitants say (5)

Down

1. These intelligent guys are sweeties (8)
2. Maybe deacon's facilities? (4)
3. Pussycat's short hum is source of tranquility for perfectionist (6)
4. On Radio X amidst criminal disdain for link (10)
5. Lost head in defeat during competition, start to reproach flimsy material (8)
6. Cynic cites "PC gone mad" (7)
7. Snatch these from Victory's mouth? (7)
8. Toys with breaking silence from shame beset by disheartened guiltiness (5)
9. Stand-up shows potentially gatecrashed by rampaging ape and uni's test subjects (6,4)
10. A hot one nobody wants to deal with (6)
11. Complaint is ringing (8)
12. Longing unfinished bronze street (6)
13. A number of years of Adrian Chiles discussing delightful everyday ephemera, primarily at random (6)
14. Retiring journalist, one in almost crazy cognitive decline (8)
15. Enjoyably lyrical in speaking to begin with. Welshman or Swede say? (4)
16. Pleasure from quite famous Taskmaster's head replacing train of doubts (5)