Pet at home getting light meal (6)
I believe the answer is:
tiffin
'light meal' is the definition.
(I've seen this before)
'pet at home getting' is the wordplay.
'pet' becomes 'tiff' (I've seen this before).
'at home' becomes 'in' ('in' can be similar in meaning to 'at home').
'getting' means one lot of letters go next to another.
'tiff'+'in'='TIFFIN'
(Other definitions for tiffin that I've seen before include "Light midday meal in India" , "Lunch (British Raj)" , "Indian midday meal" , "Light Indian repast" , "(Anglo Indian) lunch" .)