The most common and most likely answer to this crossword clue is the 9 letter word CRACKDOWN
I've seen this crossword clue in The Times
C
R
A
C
K
D
O
W
N
More clues leading to the result CRACKDOWN
- Repression having Sally in poor spirits
- Blue joke appearing first warrants severe action
- Draconian measures: news welcomed by penurious drug addict?
- Firm action reduced cocaine supply?
- Depressed after attempt to provide stern enforcement
- Restrictive measures to get the best feathers
- Police campaign reduced drug usage?
- At a disadvantage after split caused by repressive measures
- Firm preventative action as drug’s reduced in price
- Serious measure of drink after fun in Ireland
Buddy explains!

The straight part
We know that "Repression" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case repression = crackdown.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 CRACKDOWN mean?
CRACKDOWN noun- Abruptly stern measures or disciplinary action; increased enforcement