Large oven left among relatives (4)
I believe the answer is:
kiln
'large oven' is the definition.
(I've seen this before)
'left among relatives' is the wordplay.
'left' becomes 'l' (common abbreviation).
'among' means one lot of letters goes inside another (inserted letters are placed among others).
'relatives' becomes 'kin' (kin can mean relatives or family).
'l' placed into 'kin' is 'KILN'.
(Other definitions for kiln that I've seen before include "Large oven for baking pottery" , "Oven for burning lime" , "Oven for firing ceramics etc" , "Oven for firing bricks" , "Furnace for firing bricks" .)