Make anxious (7)
(Other definitions for disturb that I've seen before include "Interrupt (sleep)" , "Interrupt, annoy" , "Interrupt; upset" , "Interfere with" , "Break" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make anxious</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for perturb that I've seen before include "Disturb the composure of" , "Disconcert" , "Opera star" , "Unsettle, make anxious" , "Make unsettled" .)