Cryptic crossword No 3,041

Across

1. Secure string of horses (6)
2. After installing shower, support apprentice (7)
3. Timber deals, made periodically, probed by court (7)
4. Draw near to Northern settlement (4)
5. Politician packing case mainly to accompany march (8)
6. Lacking leading couple, develop love interest for Shrek? (6)
7. Preacher's completely devout (4)
8. Cancel a book opening, having run out (8)
9. Guardiola say, disheartened, stalls fixture? (6)
10. Heathens load vessels with silver (6)
11. Having to change hands annoys bikers (6)
12. Mule-men, with ale, ordered blue movie (10)
13. Superheated vapour: ideal when tackling yard and street (3,5)
14. Unfortunately not lean, Mum's enormous (10)
15. Committed university dons half-fit after exercise (8)
16. Tinsel's up still (6)

Down

1. Figure of speech some reporter's brought up (5)
2. Inspiring ecstasy, a love goddess approaches (7)
3. Leading hand fixes top of ratlines (5)
4. Done only casually, European tourist attraction (6,3)
5. Cavalier being vocal when he's abed? (5)
6. Singular carpet with stirring ranges of colour (7)
7. Gas worried small babies (8)
8. Cheerful setter's admitting blunder (5)
9. Leader of government preceded by his relatives? (4)
10. Head girl, missing US soldier, organised messenger (6)
11. Charge, sound as a bell (4)
12. Worthy boxer maybe returning to claim ring (4)
13. Space traveller shortly to appear (4)
14. Christmas verse taken from work of fiction (4)
15. Insignificant student publication one's promoted (6)
16. Plan to circulate local rent brochure (8)
17. Chaps processing enlargement save originals for raunchy album (9)
18. On holiday, I am weary now and then (4)