Also... the monster is not in Loch Lomond it's in Loch ness. This is a difficult one Anneho. I saw it the other day and have been giving it some thought ever since. No luck though. I'll keep trying. Good luck
But Nessie lives in Loch Ness, not Loch Lomond.
There is a monster n Loch Lomond, but I cannot (as yet) find it's name. It is said to resemble a crocodile.
The clue specifically only says Lomond, so the cryptic answeer to that bit could be "loch" (or if they're being even more devious, "town"). I agree it's a difficult one, nothing occurs to me yet.