Occurring in irregular bursts (9)
I believe the answer is:
spasmodic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">occurring in irregular bursts</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for spasmodic that I've seen before include "Occasional" , "Intermittent" , "Occurring in irregular bursts" , "Done in short bursts" , "fitfully" .)