Be about to do wrong, or threaten (4)

I believe the answer is:

bode

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'threaten' is the definition.
(thesaurus)

'be about to do wrong' is the wordplay.
'be about' is an insertion indicator.
'to' becomes 'be' (I can't justify this - if you can you should give a lot more credence to this answer).
'wrong' indicates anagramming the letters.
'do' with letters rearranged gives 'od'.
'be' enclosing 'od' is 'BODE'.

'or' is the link.

Can you help me to learn more?

(Other definitions for bode that I've seen before include "Waited" , "Augur, foreshadow" , "Augur (well, badly)" , "Portend, foretell" , "predict" .)

I've seen this clue in the Evening Standard.

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