Join forces (with) (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">join forces with</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 ally that I've seen before include "support" , "mate" , "Associate that provides assistance" , "Collaborator, affiliate" , "Band together" .)
(Other definitions for align that I've seen before include "Get straight" , "Regulate, arrange in line" , "Ally (oneself with)" , "Put in order" , "Place in the right relationship" .)