Unique feature found in British Airways' porcelain? (4,5)
I believe the answer is:
bone china
'porcelain?' is the definition.
(bone china is a kind of porcelain)
'unique feature found in british airways'' is the wordplay.
'unique' becomes 'one' (synonyms).
'feature' becomes 'chin' (chin is a kind of feature).
'found in' means one lot of letters goes inside another.
'british airways'' becomes 'BA'.
'one'+'chin'='onechin'
'onechin' put within 'ba' is 'BONE CHINA'.
(Other definitions for bone china that I've seen before include "Coalport" , "Form of white porcelain" , "Delicate base for service" , "High quality porcelain" , "fragile" .)