Completing (5)
'completing' is the definition.
('finish' can be a synonym of 'complete')
This is the entire clue.
(Another definition for finishing that I've seen is " Ending".)
'completing' is the definition.
(doing is a kind of completing)
This is the entire clue.
(Other definitions for doing that I've seen before include "visiting as a tourist" , "Making" , "Effecting" , "thrashing" , "Performing a task" .)