I'm pretty sure these are correct but would appreciate help with the parsing......
16d Monster heading off priest after prophet (9) - LEVIATHAN (Monster)
I thought the priest was LEVI followed by (n)ATHAN, who was a prophet, but the clue says the 'Heading' or first letter should come off the priest, so I've got mixed up somewhere.
17d Hand tossing good husband in channel (8) - STRAIGHT (Hand)
It looks like 'Channel' = STRAIT + G(ood) H(usband), but 'Tossing' means getting rid of so I think I've got it wrong.
24d Hopeless case in passing, one released (5) - GONER (Hopeless case)
I think it's a word meaning '(In) passing' with the letter I (one) released. But if that word is IGNORE, then the letters need to be rearranged after the 'I' deletion and I can't see any anagram indicator.