(7d) Over 21 and indigent. (4) _ U _ _.
(17d) The measure of all I survey? (9) _ E _ E _ E _ _ _ .
(19d) So plucky after a short party? (8) S _ _ _ I _ _ _ .
(20a) Teacher's grapevine? (4) _ S _ _ .
(24d) The roxy boat from Dublin? (5) _ E _ _ _ .
(27d) Drool up when thee go down! (4) T _ _ _ .
(28a) Is punctuality a priority on this one's watch? (10) _ I _ _ _ _ _ _ _ _ .