Decide, though it's close (8)
I believe the answer is:
conclude
I believe this clue is a double definition.
'decide' is the first definition.
(I've seen this before)
'it's close' is the second definition.
(thesaurus)
'though' is the link.
(Other definitions for conclude that I've seen before include "Decide - terminate" , "Decide by reasoning or draw to a close" , "Bring or come to an end (8)" , "Finish - deduce" , "Finally decide" .)