Snap fastener (5,4)
I believe the answer is:
press stud
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">snap fastener</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for press stud that I've seen before include "Virile young editor, perhaps" , "one that can hold things together" , "Small fastener" , "Popper used for fastening" , "Snap fastener" .)