Question Author
Given nobody is a able to identify an allusion to Number 10 and the pulling of a fast one in the past, I am left with the disappointing conclusion that this is a "clue wishing to convey an element of political comment", with Number 10 obviously referring to the Government of the day, and the fast one - presumably - referring to the setter's perception of Mrs May's "Chequers Deal". Whether or not solvers agree with this perceived sentiment is irrelevant to the breach of "political neutrality" that I would expect from all setters. Does anybody else have a different view on this?