Blog entries about unpleasant odour old upper class produces after death (10)
I believe the answer is:
posthumous
'after death' is the definition.
(I've seen this before)
'blog entries about unpleasant odour old upper class' is the wordplay.
'blog entries' becomes 'posts' (as in online blog posts).
'about' is an insertion indicator.
'unpleasant odour' becomes 'hum' (something with a bad smell is 'humming').
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'upper class' becomes 'u'.
'hum'+'o'+'u'='humou'
'posts' placed around 'humou' is 'POSTHUMOUS'.
'produces' is the link.
(Another definition for posthumous that I've seen is " Occurring after death".)