County has wrong date for item in private chamber (8)
I believe the answer is:
bedstead
'item in private chamber' is the definition.
'county has wrong date' is the wordplay.
'county' becomes 'beds' (abbreviation for Bedfordshire).
'has wrong' indicates an anagram (I've seen this in other clues).
'date' with letters rearranged gives 'tead'.
'beds'+'tead'='BEDSTEAD'
'for' acts as a link.
(Other definitions for bedstead that I've seen before include "Frame used for supporting a mattress" , "Frame upon which a mattress sits" , "Frame for sleepers" , "Mattress support" , "Framework supporting a sleeper" .)