Met to design emblem (5)
'emblem' is the definition.
(totem is a kind of emblem)
'met to design' is the wordplay.
'design' indicates anagramming the letters.
'metto' is an anagram of 'TOTEM'.
(Other definitions for totem that I've seen before include "Object of veneration", "Spiritually significant item", "charming symbol, say", "Natural thing adopted as an emblem", "Emblem believed to have spiritual significance".)