Building laid copper back inside renovated turrets (9)
I believe the answer is:
structure
'building' is the definition.
(I've seen this before)
'copper back inside renovated turrets' is the wordplay.
'copper' becomes 'Cu' (Cu is the chemical symbol for copper).
'back' shows that the letters should be reversed in order.
'inside' is an insertion indicator.
'renovated' indicates anagramming the letters.
'cu' back-to-front is 'uc'.
'turrets' is an anagram of 'strture'.
'uc' inserted into 'strture' is 'STRUCTURE'.
'laid' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for structure that I've seen before include "Edifice" , "Building or organised arrangement" , "make-up" , "Building; framework" .)