Chatty daughter gets posh replacement in organisation of Lord Sugar (9)
I believe the answer is:
garrulous
'chatty' is the definition.
('garrulous' can be a synonym of 'chatty')
'daughter gets posh replacement in organisation of lord sugar' is the wordplay.
I cannot really understand how this works, but
'posh' could be 'u' (abbreviation for upper-class - opposite to non-u) and 'u' is present in the answer.
'organisation' could be 'us' (U.S. is an example) and 'us' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for garrulous that I've seen before include "Loquacious and voluble" , "Chatty" , "Over-talkative" , "Excessively talkative" , "Voluble - oral gurus (anag)" .)