Travel ID (8)
I believe the answer is:
passport
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">travel id</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 passport that I've seen before include "Document to allow entry to another country" , "This ensures admission" , "Carte blanche" , "entry permit?" , "Traveller's ID" .)