Emblematic form of motet (5)
I believe the answer is:
totem
'emblematic form' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'of motet' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'motet' with letters rearranged gives 'TOTEM'.
Can you help me to learn more?
(Other definitions for totem that I've seen before include "Symbol given (undue) respect" , "Motet (anag.)" , "Symbolic pole" , "Sign" , "emblem of tribe?" .)