Fan the flames (6)
I believe the answer is:
incite
'fan the flames' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for incite that I've seen before include "Urge, instigate" , "Urge (to violence)" , "Foment, urge on" , "Encourage or stir up" , "Goad" .)