Last 4 have me stumped ....
24A : Indirectly, they make waves in uproar sometimes (4) : O???
27A : Evening without work, close to a couple of females (5,3) : ???H?,O??
19D : Seasonal visitors, informally those against leaving Nag's Head (3,4) : T?E,?A??
25D : Person who's taken in by centre-forward (3) : no letters