Wire can be a great help renovating (9)
I believe the answer is:
telegraph
'wire' is the definition.
(I know that wire can be written as telegraph)
'a great help renovating' is the wordplay.
'renovating' indicates anagramming the letters (I've seen 'renovated' mean this).
'great'+'help'='greathelp'
'greathelp' is an anagram of 'TELEGRAPH'.
'can be' is the link.
(Other definitions for telegraph that I've seen before include "Means of communication" , "A scoreboard" , "Daily" , "Messaging system" , "Signal" .)