Unexpected and inexplicable change (6)
I believe the answer is:
vagary
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unexpected and inexplicable change</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 vagary that I've seen before include "Unexpected and inexplicable change" , "Whim, caprice" , "Capricious idea for a gravy" , "Clip out, cut off" , "Erratic action" .)