Special bed turned wretched (10)
I believe the answer is:
despicable
'wretched' is the definition.
(I know that wretched can be written as despicable)
'special bed turned' is the wordplay.
'turned' indicates an anagram.
'special'+'bed'='specialbed'
'specialbed' anagrammed gives 'DESPICABLE'.
(Other definitions for despicable that I've seen before include "bum" , "Mean" , "rotten" , "Vile" .)