Old net I can repair (7)
I believe the answer is:
ancient
'old' is the definition.
(similar in meaning)
'net i can repair' is the wordplay.
'repair' is an anagram indicator (letters are fixed or repaired).
'net'+'i'+'can'='netican'
'netican' with letters rearranged gives 'ANCIENT'.
(Other definitions for ancient that I've seen before include "Antediluvian" , "Very old or belonging to times past" , "from olden times" , "Bygone" , "Old man" .)