Reportedly recognised bad smell near overturned baby (7)
I believe the answer is:
newborn
'baby' is the definition.
(I have seen 'Young baby ' mean 'newborn' so perhaps 'baby' could also mean 'newborn')
'reportedly recognised bad smell near overturned' is the wordplay.
'reportedly' shows a homophone (sound like).
'recognised' becomes 'knew' ('know' can be a synonym of 'recognize').
'bad smell' becomes 'bo' (informal abbreviation for body odour).
'near' becomes 'nr' (abbreviation used in addresses).
'overturned' says the letters should be written in reverse.
'knew' is a homophone of 'new'.
'nr' reversed gives 'rn'.
'new'+'bo'+'rn'='NEWBORN'
(Other definitions for newborn that I've seen before include "Recently delivered" , "Young baby" , "Just entered the world" , "Recently given birth to" , "Neonate" .)