Family sitting round large oven (4)
I believe the answer is:
Here is my best explanation:
'oven' is the definition.
(kiln is a kind of oven)
'family sitting round large' is the subsidiary indication.
'family' becomes 'kin' ('kin' can be a synonym of 'family'**).
'sitting round' is an insertion indicator.
'large' becomes 'l'.
'kin' enclosing 'l' is 'kiln'.
(Other definitions for kiln that I've seen before include "Baker", "Oven for firing ceramics etc", "Large oven, for potters say", "Industrial furnace", "Large commercial oven", "Oven for firing pottery", "Pottery-firing oven", "Oven for hardening and drying", "Potter's oven" and "Oven for burning lime".)