Put an end to trusted criminal carrying drug (8)
I believe the answer is:
destruct
'put an end to' is the definition.
'trusted criminal carrying drug' is the wordplay.
I cannot quite see how this works, but
'drug' could be 'c' (C is an example) and 'c' is found in the answer.
an anagram of 'trusted' is 'destrut' which is present in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for destruct that I've seen is " Destroy a missile in flight".)