Possible Clues:

• Mince pie to contain a drug
• Type of drug
• Work I consumed, that's called 'Sugar' or 'Snow'
• Sleep medication
• Cocaine, for one
• A sleep-inducing drug (6)
• Sense dulling drug
• Old head swallowed one soporific
• How one 3 down with the work I consumed
• I tucked into duck spread - it's addictive