There's nothing about mother following a beast (6)
I believe the answer is:
animal
'beast' is the definition.
(a beast is an animal)
'there's nothing about mother following a' is the wordplay.
'there's nothing' becomes 'nil' (nil means a score of zero in football).
'about' indicates putting letters inside.
'mother' becomes 'ma' (Ma is another word for mother or mum).
'following' means one lot of letters go next to another.
'nil' going around 'ma' is 'nimal'.
'nimal' after 'a' is 'ANIMAL'.
(Other definitions for animal that I've seen before include "' - - Farm', Orwell" , "Circus performer, maybe" , "Uncivilised person" , "Creature having voluntary movement" , "Source of meat" .)