Oddly poses as lawmen (5)
I believe the answer is:
posse
'lawmen' is the definition.
(I've seen this before)
'oddly poses' is the wordplay.
'oddly' is an anagram indicator.
'poses' is an anagram of 'POSSE'.
'as' is the link.
(Other definitions for posse that I've seen before include "Group of sheriff's men" , "Group of friends together" , "Troop at the service of a local sheriff" , "Group supporting sheriff" , "Sheriff's team" .)