Cryptic crossword No 2,577

Across

1. Picadors always clutching on the back (6)
2. One fractured dreadfully in race (4,2,6)
3. Check squashed quiche, occasionally put back together again (11)
4. A van and digger crashed (10)
5. Everyone in punt by one college is graceful (8)
6. Start to jump in shallow waters in inlets (6)
7. Scope in Further Education (6)
8. Expanded dictionary absorbs writer (6)
9. Great starts to mountaineering adventures in Nepal (4)
10. I dug flares frantically for rescuers (10)
11. What ho! Massive sandwiches! (6)
12. Unproductive tycoon on the radio (6)
13. Tried to surpass Australian without flight: delayed and deserted (8)

Down

1. See 22a
2. Plant functioning - see the light (6,2)
3. Potter, maybe, is brilliant (6)
4. Post Office at first gets a vehicle (7)
5. Some plan rebellious uprising (6)
6. Was indifferent: quiet and sturdy (8)
7. Setter's friend a high jumper! (6)
8. Reliable couple could be going this way (6)
9. Massage cramp - no free action (11)
10. Number of county division (7)
11. Submits to delays (6)
12. Old Elgar composed in great quantities (6)
13. Impending agreement returned: it’s taken before retirement (8)