End of road — politician in criminal case bunks off (7)

I believe the answer is:

decamps

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'bunks off' is the definition.
(bunk off can mean to decamp or leave)

'end of road politician in criminal case' is the wordplay.
'end of' says to hollow out the word (remove centre letters) (I've seen 'ends' mean this).
'road' becomes 'drive' (drive is a kind of road).
'politician in criminal case' becomes 'camps' (I can't explain this - if you can you should give a lot more credence to this answer).
'drive' with its centre taken out is 'de'.
'de'+'camps'='DECAMPS'

Can you help me to learn more?

(Other definitions for decamps that I've seen before include "Folds up the tent and departs" , "Absconds" .)

I've seen this clue in The Guardian.

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