Officer Mike a drunken laird grabs (7)
I believe the answer is:
admiral
'officer' is the definition.
(admiral is a kind of officer)
'mike a drunken laird grabs' is the wordplay.
'mike' becomes 'M' (phonetic alphabet: alpha, bravo, charlie etc.).
'drunken' indicates anagramming the letters.
'grabs' indicates putting letters inside.
'laird' anagrammed gives '[laird]'.
'a'+'[laird]'='a[laird]'
'm' put inside 'adiral' is 'ADMIRAL'.
(Other definitions for admiral that I've seen before include "High-ranking naval officer like Nelson" , "Highest ranking naval officer" , "Naval officer of high rank" , "Red butterfly in charge of the fleet" , "(White or red) butterfly" .)