Uncontaminated drug in slurpy form for swallowing (5)
I believe the answer is:
puree
'slurpy form for swallowing' is the definition.
I can't tell whether this definition defines the answer.
'uncontaminated drug in' is the wordplay.
'uncontaminated' becomes 'pure' (similar in meaning).
'drug' becomes 'e' (E is another name for ecstasy).
'in' indicates putting letters inside.
'pure' going around 'e' is 'PUREE'.
Can you help me to learn more?
(Other definitions for puree that I've seen before include "Liquidise (vegetables etc)" , "Pulped fruit or veg" , "Smooth pulp of veg/fruit" , "Smooth pulped food" , "Pulped vegetable or fruit" .)
