Half of the clues are “Definition and Letter-Mixture”, in which a sentence containing the definition of the answer also contains a mixture of the letters (always beginning at the
beginning or ending at the end of a word but also containing a superfluous letter) of the
required entry. In the other half of the clues, wordplay yields an extra letter.
5a Depressed guy embraced by master (7) ?????L? extra letter is E
11a Worry he's now become an affectedly refined man (6) ????E? extra is R
15a Unduly sanguine retreat floors men (7) ?????T? extra is G