Printer purchase (3)
I believe the answer is:
ink
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">printer purchase</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 ink that I've seen before include "See 9" , "Printer's medium" , "Writing liquid" , "Writing material" , "Pen's contents" .)