Officer runs after a GI bride disgracefully (9)
I believe the answer is:
brigadier
'officer' is the definition.
(brigadier is a kind of officer)
'runs after a gi bride disgracefully' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'after' says to put letters next to each other.
'disgracefully' indicates anagramming the letters.
'a'+'gi'+'bride'='agibride'
'agibride' anagrammed gives 'brigadie'.
'r' after 'brigadie' is 'BRIGADIER'.
(Other definitions for brigadier that I've seen before include "Army rank" , "Rank above colonel" , "High-ranking army officer" , "Military leader" , "Air bridge over to the military officer" .)