Clue: One way to kick the habit by wrapping kicking strap round compiler's middle (6)
Answer: VAPING
Explanation: Definition: One way to kick the habit

**VANG** ("kicking strap") *round* (com)**PI**(ler)
 
*A vang (or kicking strap) is a "**piece of rope that connects the lower end of the mast and the boom in order to provide a means for exerting downward force on the boom and thus controlling the shape of the sail" according to Wiktionary.