Drug injection, crack, taken casually (3,4)
I believe the answer is:
pot shot
'crack taken casually' is the definition.
I can't judge whether this definition defines the answer.
'drug injection' is the wordplay.
'drug' becomes 'pot' (slang term for cannabis).
'injection' becomes 'shot' (synonyms).
'pot'+'shot'='POT-SHOT'
Can you help me to learn more?
(Other definitions for pot shot that I've seen before include "One is fired at an easy target" , "Critical remark" , "Attempt to hit an easy target" , "Ill-considered criticism" , "Casual or random firing attempt" .)
