Finished as bridge? (4)
I believe the answer is:
over
This clue is a double definition.
'finished as' is the first definition.
(I've seen this before)
'bridge?' is the second definition.
(I've seen this before)
(Other definitions for over that I've seen before include "superior position" , "Finished like cricket session" , "Finished like round of bowling in cricket" , "Finished, concluded" , "Unit of test" .)