Graduate adopting single feature creates fine porcelain (4,5)
I believe the answer is:
bone china
'fine porcelain' is the definition.
(I've seen this before)
'graduate adopting single feature' is the wordplay.
'graduate' becomes 'ba'.
'adopting' means one lot of letters goes inside another.
'single' becomes 'one' (I've seen this before).
'feature' becomes 'chin' (chin is a kind of feature).
'one'+'chin'='onechin'
'ba' going around 'onechin' is 'BONE CHINA'.
'creates' acts as a link.
(Other definitions for bone china that I've seen before include "What may make service" , "eating off this?" , "Form of white porcelain" , "Material from Potter" , "Fine things perhaps thrown" .)