Edwardian dresser police officer upended (3)
I believe the answer is:
ted
'edwardian dresser' is the definition.
'police officer upended' is the wordplay.
'police officer' becomes 'det' (short form of Detective).
'upended' says the letters should be written backwards (in a down clue, letters go up).
'det' backwards is 'TED'.
(Other definitions for ted that I've seen before include "Turn over (hay); man's name" , "1950s teenager" , "The familiar American Senator Kennedy" , "Spread hay; man's name" , "Comic TV Father" .)