9A Small lake bends around and stretches out (7)
13D Cook chard in bun and mollusc (10)
28A Performed melody backwards for drink(7)
18D Solidly built, dim location for filming (8)
thank you
9a.S(short) = l(lake) + warps (bends) all reversed.
13d.Anagram of chard in and bun
28a.Sang (performed) + air(melody) reversed
18d.Thick(dim) + set(film location)