Arrange the sheets (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">arrange the sheets</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for collate that I've seen before include "Compare and analyse (two or more sources)" , "Assemble in sequence" , "Gather and put in order" , "Arrange (papers)" , "Bring together and arrange" .)