Creature all over mother (5)
I believe the answer is:
llama
'creature' is the definition.
(I've seen this before)
'all over mother' is the wordplay.
'over' shows that the letters should be reversed in order.
'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 "Woollen cloth" , "mammal that chews cud" , "Pack carrier" , "S American animal like a camel with soft hair" , "Andean beast of burden" .)