Clue: Dolls are scattered round outhouse: one should be in cabinet (4,5,4)
Answer: LORD PRIVY SEAL
Explanation: Definition: one should be in cabinet
An envelope ('round') of PRIVY ('outhouse') in LORDSEAL, an anagram ('scattered') of 'dolls are', for an office which has long outlived its original function; as the holder Ernest Bevin said, he was "neither a Lord, nor a Privy, nor a Seal" (but had a place in the Cabinet).