Catching sight of (7)
I believe the answer is:
espying
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">catching sight of</span>' is the definition.<br/ ><span class="explanation-format__explanation">(espying is a kind of catching sight of)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for espying that I've seen before include "Perceiving" , "Catching sight of" .)