Beast all over mother (5)
I believe the answer is:
llama
'beast' is the definition.
(I've seen this before)
'all over mother' is the wordplay.
'over' is a reversal indicator.
'mother' becomes 'ma' (Ma is another word for mother or mum).
'all' in reverse letter order is 'lla'.
'lla'+'ma'='LLAMA'
(Other definitions for llama that I've seen before include "South American animal like the camel" , "Camel-like animal" , "This could carry your stuff" , "Andean 'camel'" , "South American native" .)