Crossword Genius

Coming out of foster care, one tells of what is to come (10)

Ross

I believe the answer is:

forecaster

I'm a little stuck... Click here to teach me more about this clue!

'coming out' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'foster care one tells of what is to come' is the wordplay.
'foster care' can be anagrammed to 'FORECASTER'.
But, I'm not sure how this is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for forecaster that I've seen before include "Predicter (of, eg, weather)" , "One predicting the future" , "Prognosticator" .)

I've seen this clue in The Telegraph.
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