Animal all over mother (5)
I believe the answer is:
llama
'animal' is the definition.
(llamas are animals)
'all over mother' is the wordplay.
'over' says the letters should be written in reverse.
'mother' becomes 'ma' (ma can mean mother).
'all' in reverse letter order is 'lla'.
'lla'+'ma'='LLAMA'
(Other definitions for llama that I've seen before include "Andean pack animal" , "Even-toed camel relative" , "S American animal related to the camel" , "Peruvian camel" , "Woollen cloth" .)