Disarm me and an officer (4)
I believe the answer is:
melt
'disarm' is the definition.
(thesaurus)
'me and an officer' is the wordplay.
'and' means one lot of letters go next to another.
'an officer' becomes 'lt' (abbreviation for lieutenant).
'me'+'lt'='MELT'
(Other definitions for melt that I've seen before include "Unfreeze" , "become soft" , "Reduce from a solid to a liquid state" , "Turn to liquid" , "Thaw" .)