Excitedly close high value contract (4)
I believe the answer is:
slam
This clue is a double definition.
'excitedly close' is the first definition.
(to slam is to shut something energetically)
'high value contract' is the second definition.
(term from contract bridge)
(Other definitions for slam that I've seen before include "Report of forcefully closing" , "Severely criticise; shut (a door) forcefully" , "If it's grand, it wins all 13 tricks in bridge game" , "Close noisily" , "Shut hard" .)