He isn't a good forecaster (7,2,3)

I believe the answer is:

prophet of woe

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'he isn't a good' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'forecaster' is the wordplay.
I cannot quite see how this works, but
'forecaster' could be 'prophet' (I've seen this before) and 'prophet' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Globe and Mail.

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