Advantage retained by retired general (4)
I believe the answer is:
edge
'advantage' is the definition.
(having the edge is having an advantage)
'retained by retired general' is the wordplay.
'EDGE' is hidden within the letters.
But, I am unsure how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for edge that I've seen before include "Rim or sharp side of knife" , "Boundary; advantage" , "Move little by little to the border" , "Move furtively; intense quality" , "Sharp side of a blade" .)