Disturb right enchantress to reveal the answer and end the darkness. (8)

I believe the answer is:

brighten

I'm a little stuck... Click here to teach me more about this clue!

'answer and end the darkness' is the definition.
I can't tell whether this definition defines the answer.

'disturb right enchantress to reveal' is the wordplay.
'to reveal' indicates the answer is hidden within the clue.
'BRIGHTEN' can be found hidden inside 'disturb right enchantress'.

'the' is the link.

Can you help me to learn more?

(Other definitions for brighten that I've seen before include "Liven up" , "Cheer up; clear up" , "Provide illuminations" , "Polish" , "Berthing (anag.)" .)

I've seen this clue in The Irish Times.

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