Net emptied of cargo (5)

I believe the answer is:

clear

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'net' is the definition.
(I know that net can be written as clear)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for clear that I've seen before include "Disengaged" , "Lucid; to empty" , "Easily understood" , "Fine" , "Transparent or cloudless" .)

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

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