Seen briefly (8)
I believe the answer is:
glimpsed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seen briefly</span>' is the definition.<br/ ><span class="explanation-format__explanation">('glimpse' can be a synonym of 'see briefly')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for glimpsed that I've seen before include "Caught quick sight of" , "Caught momentary sight of" , "Saw briefly" , "Saw fleetingly" , "Seen briefly" .)