### Clue: She knocks back too much coffee laced with first two lumps of demerara (7)
### Answer: LADETTE 
 ### Explanation: Definition: She knocks back too much
 LATTE(coffee made with hot milk) **containing**(laced with) **first 2 letters of**(first two lumps of) "demerara ".
Answer: Derogatory term for a girl whose social behaviour is laddish, which includes overdrinking;knocking back too much, besides being rowdy and immature.