Gold relic designed for chamber (7)
I believe the answer is:
auricle
'chamber' is the definition.
(auricle is a kind of chamber)
'gold relic designed' is the wordplay.
'gold' becomes 'au' (Au is the chemical symbol for gold).
'designed' indicates anagramming the letters (designed with the letters).
'relic' is an anagram of 'ricle'.
'au'+'ricle'='AURICLE'
'for' acts as a link.
(Other definitions for auricle that I've seen before include "atrium" , "External part of the year." , "Upper chamber of the heart" , "External part of the ear" , "Air clue for part of the ear" .)