Carmen in East London area, leading to boos and hisses (10)

'boos and hisses' is the definition.
('barrack' can mean boo or hiss)

'carmen in east london area leading' is the wordplay.
'carmen in east london' becomes 'racking' (I can't justify this - if you can you should give a lot more credence to this answer).
'area' becomes 'bar' (bar is a kind of area).
'leading' is a charade indicator (letters next to each other).
'racking' put after 'bar' is 'BARRACKING'.

'to' acts as a link.

Can you help me to learn more?