" - by convention the definition should either start or end the clue"
This is an &Lit clue where the wordplay uses up all of the words in the clue and you have to read the whole clue again for the definition. Most of the &Lit clues that I have seen are less than satisfactory, and this is one of them.
By the way, the Friday setter in the telegraph is almost invariably Giovanni (Don Manley) and I have no reason to believe that this is not one of his.