To corrupt (7)
I believe the answer is:
deprave
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">to corrupt</span>' is the definition.<br/ ><span class="explanation-format__explanation">('deprave' can be a synonym of 'corrupt')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for deprave that I've seen before include "Pervade (anag.)" , "Make corrupt" .)