The most common and most likely answer to this crossword clue is the 11 letter word UNBREAKABLE
U
N
B
R
E
A
K
A
B
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E
Buddy explains!
The straight part
We know that "Mary Kom's own story" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mary kom's own story = unbreakable.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 UNBREAKABLE mean?
UNBREAKABLE noun- Something that cannot be broken.
- Difficult to break and therefore able to withstand rough usage
- (of a horse) not able to be broken in