Cause to start burning again (8)
I believe the answer is:
rekindle
'cause to start burning again' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for rekindle that I've seen before include "Cause to burn again" , "Light (a fire) again" , "Cause to start burning again" , "Get the fire going again" , "Revive (something lost)" .)