Try strenuously (6)
I believe the answer is:
strive
(Other definitions for strive that I've seen before include "Try hard to break rivets" , "Labour, try hard" , "Make a great effort" , "Vie; compete" , "Make every effort" .)
I believe the answer is:
strive
(Other definitions for strive that I've seen before include "Try hard to break rivets" , "Labour, try hard" , "Make a great effort" , "Vie; compete" , "Make every effort" .)