CCCWC January competition voters’ comments on Clue no. 54

A clue to UNDERGROUND.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue

1.	I see underground is listed as an adverb in the dictionary, but I'm struggling to think when you would use it for 'illegally'
2.	The significance of "rump-end" when applied to PM isn't clear.
3.	Lord’s needs an apostrophe