ATM code (3)
I believe the answer is:
pin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">atm code</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pin that I've seen before include "Badge" , "Secure" , "Stick with flag placed in golf hole" , "form of identification" , "Small object to fasten or attach" .)