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Clueless going in and out of love nest (4)

Ross

I believe the answer is:

lost

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'clueless' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for lost that I've seen before include "Baffled" , "Mogul empire official; rich person" , "Mislaid or astray" , "Mislaid or irretrievable" , "Unable to find the way forward" .)

I've seen this clue in the Irish Times.
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