Finish up in Seven Dials (3)
I believe the answer is:
end
'finish up' is the definition.
(thesaurus)
'in seven dials' is the wordplay.
'in' indicates a hidden word.
'END' can be found hidden inside 'seven dials'.
(Other definitions for end that I've seen before include "Final part" , "SECOND PART OF 10" , "Conclusion, finish" , "For Chelsea or Villa, it's a" , "Desired outcome" .)