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Regularly attending academic lecture - it's so long (5)

Ross

I believe the answer is:

adieu

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'so long' is the definition.
(both can mean goodbye)

I can't explain the remainder of the clue.

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(Other definitions for adieu that I've seen before include "So long abroad" , "Goodbye to the French" , "Goodbye, mon ami!" , "Farewell (French)" , "Adios, Arrivederci" .)

I've seen this clue in The Guardian.
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