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 in amongst the letters.
But, I'm uncertain 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" .)