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Answers are, I think, all fish, or things under the sea.

Literally the remains of snake gutted with energy by student (7)

River horse taking drug (5)

A nut returns from the heart of Scotland (8,4) -some sort of tuna?
Thanks for any help

Albacore Tuna

S(nak)e = (s and e) + e + L, sand eel.

Possibly not as I don't think it's hyphenated and I note the other clue with 2 words was given as such.

Roach?

: a silver-green European freshwater cyprinid fish (Rutilus rutilus); also : any of various related fishes (as some shiners) 2 : any of several American freshwater sunfishes

: roll of card or paper that forms the butt of a cannabis cigarette