Explain fully (9)

I think it could be either:

Which length description are you looking for?:

4,5

elucidate

(Other definitions for elucidate that I've seen before include "Throw light on a problem, make clear (9)" , "Shed light on, clarify" , "Make clear and more comprehensible" , "Make clear, explain" , "Shed light upon" .)

I've seen this clue in the Sydney Morning Herald and the King Feature Syndicate.

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