China cut back Chinese social media conclusions at home (9)
I believe the answer is:
porcelain
'china' is the definition.
(I've seen this before)
'cut back chinese social media conclusions at home' is the wordplay.
'cut' becomes 'crop' (cropping is a kind of cutting).
'back' shows that the letters should be reversed in order.
'conclusions' indicates one should take the final letters (I've seen 'conclusion' mean this).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
The final letters of 'chinese social media' are 'ela'.
'crop' back-to-front is 'porc'.
'porc'+'ela'+'in'='PORCELAIN'
(Other definitions for porcelain that I've seen before include "Fine earthenware" , "Crockery" , "Fine white ceramic" , "Fine ceramic ware" , "Form of ceramic" .)