Victors guarding island in an indolent manner, clearly (7)

I believe the answer is:

vividly

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'clearly' is the definition.
Both the answer and definition are adverbs. Maybe you can see an association between them that I can't see?

I don't understand the rest of the clue.

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(Other definitions for vividly that I've seen before include "Brightly, vibrantly" , "vigorous manner" .)

I've seen this clue in The Independent.

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