Big name in plastic (4)
I believe the answer is:
visa
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">big name in plastic</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for visa that I've seen before include "giving you access to capital?" , "Addition to passport" , "Authorisation to enter a country" , "Travel warrant" , "Travel permit stamped in passport etc" .)