Eye up (4)
I believe the answer is:
ogle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eye up</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 ogle that I've seen before include "Eye lecherously" , "Look with desire" , "Cast amorous glances" , "Eye flirtatiously" , "Regard lecherously" .)