Turn to stone (7)
I believe the answer is:
petrify
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">turn to stone</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 petrify that I've seen before include "Turn to stone" , "Paralyse with fear" , "Frighten stiff" , "Scare stiff" .)