Clue: 'Drink stock of vodka regularly', returning addicts admitted (8)
Answer: ADVOCAAT
Explanation: 'Drink stock of vodka regularly', returning addicts admitted (8)
**<=**(s)**T**(o)**C**(k)**O**(f)**V**(o)**D**(k)**A** [regularly, *returning*] with **AA** (Alcoholics Anonymous, so "addicts") *admitted