At sea, it's bad (6)

I believe the answer is:

addled

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'at sea' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for addled that I've seen before include "Perplexed -- rotten" , "Confused, mixed up like bad egg" , "Foolish or confused like bad egg" , "Confused like rotten egg" , "(Of an egg) went bad" .)

I've seen this clue in the Evening Standard.

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