The most common and most likely answer to this crossword clue is the 7 letter word HOTBEDS
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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 HOTBEDS mean?
HOTBEDS 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.