Oddly, isn't buzz associated with an animal? (7)
I believe the answer is:
inhuman
'animal?' is the definition.
(I've seen this before)
'oddly isn't buzz associated with an' is the wordplay.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'buzz' becomes 'hum' (synonyms).
'associated with' is a charade indicator (letters next to each other).
The alternate letters of 'isnt' are 'in'.
'in'+'hum'+'an'='INHUMAN'
(Other definitions for inhuman that I've seen before include "barbarous and brutal" , "Cruel, bestial" , "diabolical ..." , "Unfeelingly cruel" , "Without compunction" .)