Crossword Genius

Bill harnesses psychic ability to foretell (7)

Ross

I believe the answer is:

bespeak

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

'foretell' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

'bill harnesses psychic ability' is the wordplay.
I cannot really understand how this works, but
'bill' could be 'peak' (synonyms) and 'peak' is present in the answer.
The remaining letters 'bes' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'to' is the link.

Can you help me to learn more?

(Other definitions for bespeak that I've seen before include "Provide evidence" , "Bear witness" , "Apply for" .)

I've seen this clue in The Independent.
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