Having two functions (4-7)
I believe the answer is:
dual-purpose
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">having two functions</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 dual-purpose that I've seen before include "Twin-use" , "Having two functions" , "Serving two goals" .)