Cryptic crossword No 3,215

Across

1. Tricky moves nan and son played in Scrabble? (5-5,5)
2. Boss's secretary given buzzer that doesn't work (7)
3. Mathematician's delivery person getting the wrong entrance (7)
4. Made up and in agreement with date (6)
5. 50s classic – presumably not the original recording (4,4)
6. One on the rebound is content to neck with hot love (4)
7. A bunch of retired coppers ordered penne in European resort (9)
8. Old-fashioned denomination's terribly sad on entering bar (3,3,3)
9. Female setter has X factor? (4)
10. Blend of wheat and rye involving multiple parts (5-3)
11. Notes provided around unfinished poems (6)
12. Small quantities of heroin shifted in lofty settings (7)
13. Old pope maybe recalling one with pride (7)
14. School trips which caretakers are asked to go on (7,8)

Down

1. See 4
2. Hit on server, wanting one free drink (3,5)
3. Greek character to keep so long in Spain with programme? (5,4)
4. Base on Greek island reportedly crumbles (6)
5. Initial lack of judgement's possibly done MP in (4,4)
6. Some plutocrat fancied overturning old trade deal (5)
7. Terribly neat duet made tighter still (8)
8. Free kicks regularly taken by Methuselah in energetic practice (5)
9. Quiet PM sent up distress signal (6)
10. City welcoming a number being celebrated today? Grand! (4)
11. Standard horror film skewering cornier novel (9)
12. Republic of Dagenham and Stanmore reduced by 50% (8)
13. A bunch of bare asses shocked judge again (8)
14. American actor set aside, losing Oscar record (6)
15. Reject detective stitched up in hearing (6)
16. I Got You Babe ultimately covered by couples fronting rock groups (5)
17. Eastenders in churches covering up large mistakes (5)
18. European putting son on throne (4)