Pretty pixie captivates ghoul ultimately (6)

I believe the answer is:

fairly

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'pretty' is the definition.
(I know that pretty can be written as fairly)

I can't explain the remainder of the clue.

(Other definitions for fairly that I've seen before include "Moderately" , "Justly, without favouring one party" , "Equitably; passably" , "pretty" , "To a moderate degree" .)

I've seen this clue in The Times and The Sunday Times.

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