Spasmodically (3,3,2)
I believe the answer is:
off and on
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spasmodically</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for off and on that I've seen before include "Intermittently" , "the two sides at the Oval are this" , "switch positions" , "From time to time" , "Now and then, here and there (3, 3, 2)" .)