Bronte sister unfortunately libels the foreign lecturer (5,4)

'bronte sister unfortunately' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'libels the foreign lecturer' is the wordplay.
I cannot really see how this works, but
an anagram of 'libels' is 'ellisb' which is within the answer.
'lecturer' could be 'l' (abbreviation for lecturer) and 'l' is found in the answer.
'the foreign' could be 'el' ('the' in Spanish) and 'el' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?