Ignite again (7)
I believe the answer is:
relight
'ignite again' is the definition.
('light' is an answer for 'ignite' so perhaps 'relight' is OK for 'ignite again')
This is the entire clue.
(Other definitions for relight that I've seen before include "The girl (anag)" , "get going over" , "fire again?" , "Rekindle" , "Ignite again" .)