Question Author
Sorry, Calibax.
The instruction for this clue is, "the definition part leads to the answer to be entered and the (cryptic) remainder leads to an anagram of that answer".
The answer to be entered into the grid is clearly 'range' (definition:scale), which is an anagram of Regan ('thankless child' in King Lear). But why 'truly', and why 'last character to move to centre' when it is an anagram?
I would hate to think the setter has been sloppy, and I cannot bear not to understand the wordplay, especially if the obvious is staring me in the face!