Spinning plate, one lacks civilised instincts (6)
I believe the answer is:
animal
'one lacks civilised instincts' is the definition.
(animals are not civilised)
'spinning plate' is the wordplay.
'spinning' is a reversal indicator.
'plate' becomes 'lamina' (anatomical term for a plate or layer).
'lamina' reversed gives 'ANIMAL'.
(Other definitions for animal that I've seen before include "Creature having voluntary movement" , "savage" , "Neither vegetable nor mineral" , "Uncivilised person" , "lamb, perhaps" .)