Criminal may receive this, delivered enclosed with drug (8)
I believe the answer is:
sentence
'criminal may receive this' is the definition.
(as in a prison sentence)
'delivered enclosed with drug' is the wordplay.
'delivered' becomes 'sent' (I've seen this in another clue).
'enclosed' becomes 'enc' (abbreviation for 'enclosed' as in letters).
'with' says to put letters next to each other.
'drug' becomes 'e' (E is another name for ecstasy).
'sent'+'enc'+'e'='SENTENCE'
(Other definitions for sentence that I've seen before include "String of words or term in prison" , "expressed in a few words" , "Written" , "Judgment on convict" , "Ability to feel" .)