Beneficial manoeuvre (9)
I believe the answer is:
expedient
I believe this is a double definition.
'beneficial' is the first definition.
(thesaurus)
'manoeuvre' is the second definition.
(expedient can mean a manoeuvre or tactic)
(Other definitions for expedient that I've seen before include "Convenient for a particular purpose" , "Handy" , "Advisable" , "Suited to the circumstances" , "Suitable or appropriate" .)