Porcelain from Switzerland popular with Austria's leader (5)
I believe the answer is:
china
'porcelain' is the definition.
(china is a kind of porcelain)
'switzerland popular with austria's leader' is the wordplay.
'switzerland' becomes 'ch' (short for Confoederatio Helvetica, its Latin name).
'popular' becomes 'in'.
'with' says to put letters next to each other.
'leader' suggests taking the first letters.
The initial letter of 'austria' is 'a'.
'ch'+'in'+'a'='CHINA'
'from' is the link.
(Other definitions for china that I've seen before include "Ceramic; mate" , "Modern name for old Cathay" , "symbolised by RS [RED STAR] (separately)" , "porcelain vessels?" , "Large country; mate" .)