Small-headed nail (4)
I believe the answer is:
brad
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small-headed nail</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 brad that I've seen before include "Small tapering nail" , "One to get hammered" , "-- Pitt, US actor" , "One may secure" , "Fixer" .)