Clue: Basil, say, one against hotel regularly taking recipe for salad eater? (9)
Answer: HERBIVORE
Explanation: Basil, say, one against hotel regularly taking recipe for salad eater? (9)
HERB (Basil is one) +I V[ersus] + R in [h]O[t]E[l], with a surface reference to *Fawlty Towers*, particularly the episode where a loud-mouthed American guest asks for Waldorf salad, and is told by the bemused Basil that "I think we're just out of Waldorfs"