Animal house on front of garden (3)
I believe the answer is:
hog
'animal' is the definition.
(hog is a kind of animal)
'house on front of garden' is the wordplay.
'house' becomes 'ho' (abbreviation for house).
'on' says to put letters next to each other.
'front of' suggests taking the first letters.
The first letter of 'garden' is 'g'.
'ho'+'g'='HOG'
(Other definitions for hog that I've seen before include "Selfish type" , "Porker" , "source of meat" , "Pig; hoard selfishly" , "Domestic adult swine" .)