Confuse; go off (5)
I believe the answer is:
addle
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">confuse</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that addle is a type of confuse)</span><br/ ><br/ >'<span class="explanation-format__original">go off</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(eg an egg might addle)</span><br/ ><br/ ></span>
(Other definitions for addle that I've seen before include "Get confused" , "(Of eggs) turn bad" , "Mix up or confuse" , "Make rotten" , "(Of egg) become rotten" .)