The most common and most likely answer to this crossword clue is the 3 plus 4 letter word RUN RIOT
I've seen this crossword clue in The Times
R
U
N
R
I
O
T
More clues leading to the result RUN RIOT
- Manage port, given time to grow profusely
- Go berserk, having to manage tumultuous crowd
- Behave wildly, iron into track
- One needs to manage with corruption about to be rampant
- Spread uncontrollably right around a French city
- Little baby going around city causing rampage
- Series on musical group first to last getting to act unrestrainedly
- Bolt with electric current inserted in balls – go berserk
- Go wild in Turin or party
- Grow profusely in enclosure — impressively large display
Buddy explains!
The straight part
We know that "to be rampant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case to be rampant = run riot.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.