Worried about brief to offer one present (8)

I believe the answer is:

attendee

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'one present' is the definition.
(someone present or attending)

I don't understand the rest of the clue.

(Other definitions for attendee that I've seen before include "Person who is present at an event" , "One present at a meeting" , "One shows up" , "One present (at event)" , "One coming" .)

I've seen this clue in The Times.

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