Minor deviation (4)
I believe the answer is:
blip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">minor deviation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for blip that I've seen before include "Minor (and temporary) deviation from trend" , "Radar image; minor deviation" , "Echo displayed on a radar screen" , "shows up on radar screen" , "Unforeseen irregularity" .)