Crossword Genius

Impolitely go away with frequency following promotion (3,3)

Ross

I believe the answer is:

bog off

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

'frequency following promotion' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'impolitely go away' is the wordplay.
I cannot quite understand how this works, but
'go' is present in the answer.
'away' could be 'off' (synonyms) and 'off' is present in the answer.
A single letter 'b' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

'with' acts as a link.

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