Furnish again (5)
I believe the answer is:
refit
'furnish again' is the definition.
('fit' is an answer for 'furnish' so perhaps 'refit' is OK for 'furnish again')
This is the entire clue.
(Other definitions for refit that I've seen before include "restoration of ship" , "provision of new equipment" , "Repair - renew" , "Overhaul (ship's equipment)" , "Process of improving equipment" .)