1. Plosive meets slithery thing (we hear) on Caradhras.
2. ABBA song swallows little Beatrice. It’s exhausting!
3. Oo, they’re awful!
4. Cousins of Vogons? They torment with onomatopoeia!
5. Submerged stalker, or just a wet TV addict?
EMYN MUIL: Lovable rugby player loses surname and liquid, but gains an equine hybrid here, we hear!
AMON HEN: Grumble about chicken? Here?
8. ‘Lotsss of thisss in Mordor, my Preciouss!’ (he gasped).
9. Do this only for a taste of justice or a world of truth. (The twin of the last clue).
10. Nice place? No, a slum. Messed up.
11. Breathing apparatus swallows map-book, in confusion. (They’re so bad at finding people, you’d think they had, too).
12. Terror of Cirith Ungol.
13. Morning marathon around (or rather up) here – and the final one.
14. To hear these might well dement. Perhaps they were played to Frodo in Cirith Ungol?
15. Much harder than feather-beds!
16. Hateful road brings epiphany of danger – and this.
ARAGORN'S SINGING: Beren and Luthien, brought to the camp-fire by this.
DEAD MARSHES: Inanimate bogs.
It wasn't the *location* that brought them to the camp-fire, was it?
But I'll give it to you, (see answer above), for realising it was Aragorn's singing that did it, and because it's perhaps an unusual kind of answer to a clue.
And yes, I think it's funny too. Don't say Mordor and call him You Know Who, but let's have a song and a fire.
Especially because I tend to think of Robert Stephens's Aragorn, and how pompous he sounds when he's telling them off (although not quite as pompous as when he becomes king!)
And yes, there is a theme. And also one odd-one-out/sort of trick answer. (Only one, though).