A doctor distributed guns within our ranks (5,2)
I believe the answer is:
among us
'within our ranks' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'a doctor distributed guns' is the wordplay.
'doctor' becomes 'mo' (medical officer).
'distributed' indicates anagramming the letters.
'guns' with letters rearranged gives 'ngus'.
'a'+'mo'+'ngus'='AMONG US'
Can you help me to learn more?
(Another definition for among us that I've seen is " So aliens are said to walk".)