Spasmodic (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spasmodic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that spasmodic can be written as fitful)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for fitful that I've seen before include "Spasmodic, intermittent" , "Occurring in short periods, not regular or steady" , "Occuring in short periods, irregular" , "Restless, unsettled" , "Restless or sporadic" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spasmodic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for jerky that I've seen before include "Having irregular movements" , "Lacking steady rhythm" , "Spasmodic" , "Sun-dried strips of beef" , "Using abrupt movements" .)