The most common and most likely answer to this crossword clue is the 10 letter word PALINDROME
I've seen this crossword clue in Financial Times
P
A
L
I
N
D
R
O
M
E
More clues leading to the result PALINDROME
- One such as dad, mum or sis — though not bro!
- Maybe Hannah's daughter welcomed by Italian friend?
- … Abba or A-ha?
- Comic traveller and daughter see madam?
- Sexes, perhaps, mate in Germany’s capital city
- For example if I had a hi-fi, I’d plan more dances
- One’s a nana!
- Nan perhaps, ending in bed hugged by Caesar’s friend, perhaps
- No, It is opposition also from the east that makes this!
- Bob for example finds prime land to develop around Ohio
Buddy explains!

The straight part
We know that "madam" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case madam = palindrome.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 PALINDROME mean?
PALINDROME noun- A word, phrase, number or any other sequence of units which has the property of reading the same forwards as it does backwards, character for character, sometimes disregarding punctuation, capitalization and diacritics.
- (by extension) A poetic form in which the sequence of words reads the same in either direction.
- A stretch of DNA in which the sequence of nucleotides on one strand are in the reverse order to that of the complementary strand