Professional wordless musical piece taken up before journalist predicted (14)

I believe the answer is:

prognosticated

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'predicted' is the definition.
('prognosticate' can be a synonym of 'predict')

'professional wordless musical piece taken up before journalist' is the wordplay.
I cannot really see how this works, but
'professional' could be 'pro' (abbreviation) and 'pro' is found in the answer.
'piece' could be 'os' (os is a kind of piece) and 'os' is found in the answer.
'taken' could be 'ate' (eating is a kind of taking) and 'ate' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Telegraph.

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