The most common and most likely answer to this crossword clue is the 9 letter word CLAMPDOWN
I've seen this crossword clue in The Daily Telegraph
C
L
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N
More clues leading to the result CLAMPDOWN
- Control Spooner’s sweaty fool
- Restriction has Labour leader in party despondent
- Suppression of left in party rather sad
- Restrictive practice has Liberal in party leaving London?
- Spooner’s wet fool in Blitz
- Vice has fallen with stringent suppression
- Sudden restriction on vice by Irish county
- Suppressive measure from buffoon imprisoning a politician
- Vice squad ultimately have restraint
- Attempt to suppress principal in Cambridge, light blue
Buddy explains!

The straight part
We know that "Suppressive measure" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case suppressive measure = clampdown.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 CLAMPDOWN mean?
CLAMPDOWN noun- A sudden repressive or punitive restriction or control