Cryptic crossword

ACROSS 1. A cast entering competition with lots of money (6,2) 5. Use the toilet during school talk (6) 9. Runner, one who always seems to be happy, given no start (5) 10. Polish – it is a potential problem for speaker (9) 12. Sling the spoiled end bits of suss delicacy (10) 13. Tenant giving up an abode meant to be temporary (4) 15. Greedy person cooked one bird (6) 16. Put money back into venture to control undercover gear (8) 18. Staff seizing a load of unwanted mail about contents of street directory (4,4) 20. Car transported around one from nice house (6) 23. Permission to use ring in computer network (4) 24. Repaired shutter with strange chemical that aids extraction (5,5) 27. Briefly discusses painful outburst admitted by the Maori lad (7,2) 28. Studies plugged by a number of tertiary administrators (5) 29. Caretaker at the front bends over and disposes of unwanted material (6) 30. Individuals broken by lieutenant’s punishing activities (8)

DOWN

1. Mischievous child, with head down the back, uses thirteen (5) 2. Applying preservative from large container kept in sink (7) 3. Underground workers somewhat upset about rights handled separately (10) 4. Heart of church man is vital (6) 6. Support an appointment (4) 7, 17. “Sex romp” setter redefined as “unconventional recreational activities” (7,6) 8. Wavering atheist or one unwilling to make a commitment (9) 11. Ring tallest member of team involved in consumer’s expulsion (6) 14. An armed conflict settled down with input from present-day leader of Egypt (5,5) 15. Usual number associated with a large city, turned up very drunk (9) 17. See 7 Down 19. Generally scouts set out from assault course in a disorderly fashion (2,1,4) 21. Wartime Australian leader supporting a hanging (7) 22. Point of view taken by good man – an Anglican (6) 25. Young lady, taking time, becomes veiled (5) 26. Asian country ignoring a prominent feature (4)