Cryptic crossword No 3,489

Across

1. Pack plug (for a period working away) (4)
2. Shearer unlikely selection for second race (5)
3. Monument of Saint Helen unveiled (5)
4. With difficulty remand teen for ‘sweet nothing’ (10)
5. Attracts insects to bench when boron not applied (8)
6. Contents of stew? Kelp and sesame (4)
7. Mum originally solved twitch getting gum (6)
8. Beetle’s vigil (10)
9. Suggesting close shave with cut (4)
10. Short article below hinting at crash (7)
11. She doesn’t believe half of what he is telling at the start (7)
12. Impressive result from digital camera (4)
13. Spell ‘ray’ with extra r (6)
14. Dog returned to noble coming to royal retreat (8)
15. Alternatively, lie head to tail in window recess (5)

Down

1. For Sartre, no smell an indication of overall racial otherness (3-5)
2. Find plenty of activity here before coming back (4)
3. Cross-country race off-course (10)
4. Clue in aphid denticles (6)
5. Indian goddess’s instrument unfinished (4)
6. A gross encore (5)
7. Alfalfa provoked ulcer with ‘gas’ (7)
8. Abandon brush (5)
9. Shirts advertised without logos leading to grievances (7)
10. Tel cryptically generating loophole (3-3)
11. Scribe’s instrument (8)
12. Hollow pipe stuck in earth repeatedly required for fencing (4)
13. Easy in Scotland to come from place where witches live having hat stolen (4)
14. Once frighten a bear to abandon Britain for France (5)
15. Play practical joke and flog the Persian? (4,3,3)