Clue: On turning, whisk ain't making jelly (7)
Answer: GELATIN
Explanation: Definition: jelly
A charade of GEL, a reversal ('~~on~~ turning') of LEG (~~'whisk' in the sense of move rapidly~~*'on', cricket*) plus ATIN, an anagram (~~'making'~~*'whisk'*) of 'aint'.* A case of overlooking the obvious. Thanks to Gaufrid et al for pointing this out.