The most common and most likely answer to this crossword clue is the 6 letter word HOTBED
I've seen this crossword clue in The Daily Telegraph
H
O
T
B
E
D
More clues leading to the result HOTBED
- Conditions for favourable growth? It means one shouldn't have cold feet
- Breeding ground cultivated to catch disease
- Bizarrely, the body, with no end of dairy, becomes a breeding ground
- Sexy bottom? It might encourĀage rapid but unwelcome developments
- It encourages rapid development in established case pursuing stolen barrels
- Passionate shag that might add inches to your melons?
- Forced development here hurt both earl and duke
- Exciting bottom seen in place of undesirable activity
Buddy explains!

The straight part
We know that "place of undesirable activity" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case place of undesirable activity = hotbed.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 HOTBED mean?
HOTBED noun- A low bed of earth covered with glass, and heated with rotting manure, used for the germination of seeds and the growth of tender plants, like a miniature hothouse.
- (by extension) An environment that is ideal for the growth or development of something, especially of something undesirable.
- An iron platform in a rolling mill, on which hot bars, rails, etc., are laid to cool.