Make straight (5)
I believe the answer is:
align
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make straight</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for align that I've seen before include "Dress; make straight" , "Join as ally of malignant sort (5)" , "Adjust -coordinate" , "Bring into agreement" , "Get straight" .)