A prophet, one observes (4)

I believe the answer is:

seer

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'a prophet' is the definition.
(both can mean someone who tells the future)

I can't explain the remainder of the clue.

(Other definitions for seer that I've seen before include "Fortune-teller" , "Oracle or prophet" , "Person with unusual powers of foresight" , "Person who can read the future" , "Visionary person" .)

I've seen this clue in the Evening Standard.

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