Strong fire or flame (5)
I believe the answer is:
blaze
I believe this is a double definition.
'strong fire' is the first definition.
(I've seen this before)
'flame' is the second definition.
(I know that blaze is a type of flame)
(Other definitions for blaze that I've seen before include "Strong fire" , "Strong flame that burns brightly" , "Burn with a strong flame" , "brilliant" , "Vivid display" .)