Amount of printed matter (6)
I believe the answer is:
linage
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">amount of printed matter</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 linage that I've seen before include "length of article?" , "Length of printed piece" , "amount of editorial matter" , "Measure of text length" .)