The most common and most likely answer to this crossword clue is the 6 letter word MADRAS
I've seen this crossword clue in The Guardian
M
A
D
R
A
S
More clues leading to the result MADRAS
- Remarkable dramas in Indian city of old
- Crazy capital of Rajasthan, as old Indian city
- A doctor tucking into old lady’s curry
- Most of the school is in old Chennai
- Passionate painter’s in India
- Old city of crazy artists
- Bright headscarf mother folded on head
- Plays mother, up-front for something hot?
- curry
- Dramas broadcast in Indian city recalled
Buddy explains!

The straight part
We know that "Old city" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old city = madras.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MADRAS mean?
MADRAS noun- A brightly colored cotton fabric with a checked or striped pattern.
- A large handkerchief of this fabric, worn on the head in the West Indies.