Small metal spike (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small metal spike</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nail that I've seen before include "Fasten, catch (criminal)" , "Horny covering of the digits" , "Brad, say" , "Hammered individual" , "for the carpenter?" .)
(Other definitions for pin that I've seen before include "Number allocated for electronic transactions" , "Cashpoint code" , "Fastener; skittle" , "Small pointed metal fastener" , "Badge" .)