City Road in revised A-Z (10)
I believe the answer is:
dictionary
'a-z' is the definition.
(a dictionary lists words from A-Z)
'city road in revised' is the wordplay.
'revised' indicates anagramming the letters.
'city'+'road'+'in'='cityroadin'
'cityroadin' is an anagram of 'DICTIONARY'.
(Other definitions for dictionary that I've seen before include "glossary" , "Lexicon" , "Brewer's creation, say" , "Work full of meaning" , "reference work" .)