Tally's assembled in the end (6)
I believe the answer is:
lastly
'in the end' is the definition.
(I've seen this before)
'tally's assembled' is the wordplay.
'assembled' is an anagram indicator.
'tallys' with letters rearranged gives 'LASTLY'.
(Other definitions for lastly that I've seen before include "In the end" , "In conclusion" , "Finally, to conclude with" .)