Coincide and finished on circuit (7)
I believe the answer is:
overlap
'coincide' is the definition.
(I know that overlap is a kind of coincide)
'finished on circuit' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'circuit' becomes 'lap' (synonyms).
'over'+'lap'='OVERLAP'
'and' acts as a link.
(Other definitions for overlap that I've seen before include "Rest one on another" , "common ground" , "Partly coincide in time, length etc" , "Ride" , "Lie partly on top of" .)