Clue: Temple ornament I'd made badly (6)
Answer: DIADEM
Explanation: Definition: Temple ornament
An anagram ('badly') of 'I'd made'. The nearest I can get to justifying the 'temple' in the definition is the hymn: The head that once was crowned with thorns,
 Is crowned with glory now,
 A royal diadem adorns
 The mighty victor's brow.