Bar that’s fashionable acquired (5)
I believe the answer is:
ingot
'bar' is the definition.
(thesaurus)
'fashionable acquired' is the wordplay.
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'acquired' becomes 'got' ('get' can be a synonym of 'acquire').
'in'+'got'='INGOT'
'that's' is the link.
(Other definitions for ingot that I've seen before include "A lump of metal, perhaps gold" , "valuable block" , "Cast metal brick" , "Bar of cast metal" , "Block of, eg, gold" .)