Something hot left to be grasped by family (4)
I believe the answer is:
kiln
'something hot' is the definition.
(type of furnace)
'left to be grasped by family' is the wordplay.
'left' becomes 'l' (common abbreviation).
'to be grasped by' indicates putting letters inside (I've seen this in other clues).
'family' becomes 'kin' (synonyms).
'l' inserted within 'kin' is 'KILN'.
(Other definitions for kiln that I've seen before include "Pottery-firing oven" , "Oven for firing pottery" , "Large oven, for potters say" , "Industrial furnace" , "Oven for firing bricks" .)