Sounds too bored to go too far (9)

I believe the answer is:

overboard

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'far' is the definition.
Both the answer and definition are adverbs. Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for overboard that I've seen before include "Off boat into water" , "(Going) from a ship into the water" , "Man ...! Stop the ship" , "Very enthusiastic" , "OTT" .)

I've seen this clue in the Sydney Morning Herald.

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