1: Rejecting crew's work on board, you rest at the stern (8,3)
6: Behind and down and out (3)
9: Exchange concealed proprietary knowledge (5,6)
11: Officer scratches passageway backing out (7)
12: Interrupted by yells of pain, Dr. Edward napped (7)
14: Heads appearing strange in distorting lens (7)
15: English scenes reproduced for 'Nature' (7)
16: Hang South American author at crack of dawn (7)
19: On the way back, I had to keep calm and concentrate (7)
21: Lionel train originally given to Ron Howard on 'Happy Days' (7)
22: Wild sire ran from Nevada mountain range (7)
23: Employ heart-broken Spartans where disaster came to pass. (11)
24: How to eat the heart of marsupial (3)
25: Mere chance of depression interrupting peace (11)