Half of them finished and corrected (7)
I believe the answer is:
emended
'corrected' is the definition.
(I've seen this before)
'half of them finished' is the wordplay.
'half of' suggests halving the letters.
'finished' becomes 'ended' ('end' can be a synonym of 'finish').
'them' with half the letters taken is 'em'.
'em'+'ended'='EMENDED'
'and' is the link.
(Other definitions for emended that I've seen before include "Corrected, revised (a text)" , "Acted like editors" , "did some editing" , "Rectified" , "Refined" .)