Crossword Genius

Feature of Brontë novel is a desire (9)

Ross

I believe the answer is:

diaeresis

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'feature of bronte' is the definition.
I can't tell whether this defines the answer.

'novel is a desire' is the wordplay.
'novel' indicates an anagram (letters in a new or novel order).
'is'+'a'+'desire'='isadesire'
'isadesire' is an anagram of 'DIAERESIS'.

Can you help me to learn more?

(Other definitions for diaeresis that I've seen before include "Mark of two dots over a vowel" , "A couple of points" , "naive, lacking this?" .)

I've seen this clue in The Independent.
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