Crossword Genius

Captivate 1,440, but with the first off (7)

Ross

I believe the answer is:

engross

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'captivate' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for engross that I've seen before include "Completely absorb" , "Totally absorb the attention of" , "Occupy attention fully, absorb" , "grab attention" , "Absorb the attention of (someone)" .)

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