Snail mail need (5)
I believe the answer is:
stamp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">snail mail need</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 stamp that I've seen before include "Evidence of payment of postage duty" , "Mark of approval" , "put one's foot down hard" , "Philatelist's item" , "Impress; postage sticker" .)