Not straight or level (5)
I believe the answer is:
askew
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not straight or level</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for askew that I've seen before include "Leaning to one side" , "Twisted" , "Wonky" , "irregular" , "Out of line" .)