Information about idiots raised in a cosy home? (7)
I believe the answer is:
nesting
'in a cosy home?' is the definition.
(being cosy in a nest)
'information about idiots raised' is the wordplay.
'information' becomes 'gen' (gen can informally mean information).
'about' is an insertion indicator.
'idiots' becomes 'nits' (nit can mean a stupid person).
'raised' says the letters should be written in reverse.
'gen' going around 'nits' is 'gnitsen'.
'gnitsen' backwards is 'NESTING'.
(Another definition for nesting that I've seen is " (Of birds) building a home".)