Finish in seven days (3)
I believe the answer is:
end
'finish' is the definition.
(I know that finish can be written as end)
'in seven days' is the wordplay.
'in' indicates the answer is hidden within the clue.
'END' is hidden within 'seven days'.
(Other definitions for end that I've seen before include "Aim; stop" , "result" , "Limit" , "For Chelsea or Villa, it's a" , "Unyielding" .)