Direct at Mike, a lunatic (4,3)
I believe the answer is:
take aim
'direct' is the definition.
(I know that direct can be written as take aim)
'at mike a lunatic' is the wordplay.
'lunatic' indicates an anagram.
'at'+'mike'+'a'='atmikea'
'atmikea' anagrammed gives 'TAKE AIM'.
(Other definitions for take aim that I've seen before include "Point gun at one's target" , "Fire's said to follow this" , "train" , "Sight a target" , "Point a weapon at the target" .)