One of 78 in a pack of cards (5)
I believe the answer is:
tarot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one of 78 in a pack of cards</span>' is the definition.<br/ ><span class="explanation-format__explanation">(Tarot decks have 78 cards each with a tarot)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tarot that I've seen before include "Playing cards" , "Picture card" , "one may have been taken from deck" , "Arcana cards" , "Cards often used in fortune-telling" .)