Posh bore with CD that's entertaining crashed net once (4-9)
I believe the answer is:
well-connected
'posh' is the definition.
(well-connected socially)
'bore with cd that's entertaining crashed net once' is the wordplay.
'bore' becomes 'well' (I've seen this before).
'with' says to put letters next to each other.
'that's entertaining' indicates putting letters inside.
'crashed' indicates anagramming the letters.
'net'+'once'='netonce'
'netonce' anagrammed gives 'onnecte'.
'cd' placed around 'onnecte' is 'connected'.
'well'+'connected'='WELL-CONNECTED'
(Other definitions for well-connected that I've seen before include "Having influential friends" , "Having influential associates" , "With eminent contacts" , "Closely associated with top people" , "Knowing influential people" .)