The most common and most likely answer to this crossword clue is the 9 letter word REPRESSED
I've seen this crossword clue in The Sunday Telegraph
R
E
P
R
E
S
S
E
D
More clues leading to the result REPRESSED
Buddy explains!

The straight part
We know that "put down" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case put down = repressed.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 REPRESSED mean?
REPRESSED verb- To press again.
- Subjected to repression.
- Showing the suppression of emotions or impulses.