Old-fashioned commanding officer with me reveals result (7)
I believe the answer is:
outcome
'result' is the definition.
(something's outcome is its result or consequence)
'old-fashioned commanding officer with me' is the wordplay.
'old-fashioned' becomes 'out' (as opposed to 'in').
'commanding officer' becomes 'co'.
'with' means one lot of letters go next to another.
'out'+'co'+'me'='OUTCOME'
'reveals' acts as a link.
(Other definitions for outcome that I've seen before include "Cute moo (anag.)" , "Consequence, upshot" , "Result or consequence" , "End result" , "answer" .)