One tending to brood and attack animal (5,4)
I believe the answer is:
nanny goat
'animal' is the definition.
(I have seen 'Female animal' mean 'nanny goat' so perhaps 'animal' could also mean 'nanny goat')
'one tending to brood and attack' is the wordplay.
'one tending to brood' becomes 'nanny'.
'and' says to put letters next to each other.
'attack' becomes 'goat' (go at).
'nanny'+'goat'='NANNY-GOAT'
(Other definitions for nanny goat that I've seen before include "Billy's partner?" , "Butter" , "Female farm animal" , "milk producer" .)