Burning desire? (5)
I believe the answer is:
arson
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">burning desire?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for arson that I've seen before include "Crime involving fire" , "Crime of fire-setting (5)" , "Sonar (anag.)" , "matchplay, say?" , "Act of a pyromaniac" .)