Rust (7)
I believe the answer is:
corrode
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rust</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that rust can be written as corrode)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for corrode that I've seen before include "Eg, to rust" , "Oxidise" , "Gradually weaken (by chemical action)" , "Cause to rust" , "Growth in hazel buds" .)