Burst of extravagance (7)
I believe the answer is:
splurge
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">burst of extravagance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for splurge that I've seen before include "Spend a lot" , "lashing out" , "Spend extravagantly" , "Fork out" , "Splash out" .)