Foul up (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">foul up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(both can mean to blunder)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for err that I've seen before include "Miss the mark" , "Be mistaken" , "Go wrong" , "Leave the straight and narrow" , "have an affair?" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">foul up</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for botch that I've seen before include "Spoil by clumsy work, make a hames of" , "Carry out (task) badly" , "Mend clumsily" , "Spoil through clumsiness" , "mistake" .)