Temporary setback (4)
I believe the answer is:
blip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">temporary setback</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 blip that I've seen before include "Small mark - unforeseen deviation" , "Radar image; minor deviation" , "Short-lived deviation" , "Temporary exception" , "minor inconvenience" .)