Delight if family houses pet (4)
I believe the answer is:
tiff
'pet' is the definition.
(I've seen this in another clue)
'delight if family houses' is the wordplay.
'houses' indicates the answer is hidden within the clue (part of the clue houses the answer).
'TIFF' is hidden in the letters of 'delight if family'.
(Other definitions for tiff that I've seen before include "Row; argument" , "A minor quarrel of disagreement" , "Slight argument" , "Mild quarrel" , "causing quarrel" .)