Sexy bottom seen in breeding-ground (6)

I believe the answer is:

hotbed

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'in breeding-ground' is the definition.
I can't judge whether this defines the answer.

'sexy bottom' is the wordplay.
'sexy' becomes 'hot' (similar in meaning).
'bottom' becomes 'bed' (synonyms).
'hot'+'bed'='HOTBED'

'seen' is the link.

Can you help me to learn more?

(Other definitions for hotbed that I've seen before include "Place with ideal conditions for development" , "Place with ideal conditions for rapid growth" , "Scene of rapid growth, as of intrigue" , "Forced to grow up early in this" , "vicious place" .)

I've seen this clue in The Sun.

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