1: Yap about overdue wages (4,3)
4: Again Italian couple is late (7)
7: Timely introduction of purifier into terribly poor air (9)
9: Vagrant going over a little river to a foreign country (5)
11: Sahl joke: House's last two loan agreements (9)
12: Fill-in professional almost rewrote the column (5)
13: Steer TS into alternative routes (4,7)
15: About....about right? Wrong! (3)
16: Clothilda is carrying a parcel (3)
17: Hang back, keeping right next to person buying a jumper (11)
22: Unstained slip covers (9)
25: Rusty hinge makes animal cry (5)
26: Persistently ask for one silly prom song (9)
27: Candidate has no time for ease, apparently (7)
28: Stand up funny as partner to a broom? (7)