Perturb (7)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">perturb</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that perturb can be written as trouble)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for trouble that I've seen before include "Difficulty; cause distress to" , "Discord" , "Distress, upset or worry" , "Anxiety - disturbance - problem" , "Effort - (cause of) worry" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">perturb</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 unnerve that I've seen before include "Disconcert, make ill at ease" , "Intimidate" , "Faze" , "Perturb" , "Discourage - demoralise" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">perturb</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 agitate that I've seen before include "Stir (up public opinion?)" , "Trouble, make nervous" , "'Stir, excite (7)'" , "Get upset" , "Stir vigorously" .)