22,
I am wondering if there is something missing from the clue?
AGATHA.
A is in the clue.
A delightful person could be a "gas"?
With anagram of "hat".
But, nothing indicating how to get rid of the "s" in "gas"?
A GA(S) THA ????
Ah! Well done, Jono!
A good bit of sleuthing there!
That clue was niggling away at me and as there are some excellent solvers on the forum who did not respond to it, I thought there may be an error or somesuch in the clue.