An old work about an Indian city (5)
I believe the answer is:
poona
'an indian city' is the definition.
(I've seen this before)
'an old work about' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'work' becomes 'op' (abbreviation for opus).
'about' says the letters should be written in reverse.
'an'+'o'+'op'='anoop'
'anoop' written backwards gives 'POONA'.
(Other definitions for poona that I've seen before include "city of India" , "W Indian city" , "city in Maharashtra" .)