www.thefreedictionary.com/tail
Define tail. tail synonyms, tail pronunciation, tail translation, English ... 8. a person who trails or keeps a close surveillance of another, as a detective or spy.
Many thanks elliemay1 and scorpiojo the clue that gave the 'l'was rascal which I got as rapscallion it was the first l. The o came fro the clue censure which with the other letters I assumed was condemn so I'm at a bit of a loss.
Many thanks everyone and very sorry to put you to all the trouble.
The answer to the clue in Mondays Scotsman is 'Fools' so I think there was a mistake in the original clue possibly it is defectives rather than detectives.
Many thanks for your efforts.