Set aflame (6)
I believe the answer is:
ignite
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">set aflame</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ignite that I've seen before include "Cause to catch fire" , "Cause to start burning" , "Spark off" , "'Set alight, fire up (6)'" , "Set fire to, light up" .)