ACROSS
 8. <places that Americans go in> WASHROOMS = WA + SHROOMS
10. <passenger ship> LINER = DUBLINER - DUB
11. R inside TOO + PER = TROOPER <soldier>
12. <yob> RUFFIAN = FUNFAIR*
13. (EL DER) = ELDER <Sambucus tree>
15. <rebel> INSURGENT = (GUNNER IS)* _T
17. <Sports Day event> THREE-LEGGED RACE = _T CHEERLEADER* outside EGG
19. <continued> PRESSED ON = PR E S ←NODES←
21. <winter vehicles> SLEDS = S_ LEDS
23. <blunders> FOLLIES = F_ OLLIES
25. _T EARFUL = TEARFUL <weepy>
27. - M, CONDOM = CONDO <apartment>
28. <Irish> GALWEGIAN = GAL (WE_ GIAN_)

DOWN
 1. SWAT HE = SWATHE <bind>
 2. <capital city> OSLO = "OZ LOW"
 3. LORE outside RAIN = LORRAINE <French region>
 4. <god> OSIRIS = O S_ + IRIS
 5. <leader of staff> CLEF = (.y)CLE F(a.)
 6. N ERA inside INCITE = INCINERATE <fire>
 7. <dark-haired lady> BRUNETTE = "BREW NET"
 9. RE PAR + TEES = REPARTEES <witticisms>
14. <tea> DARJEELING = →"JAR DEALING"←
16. R + IDES + HARE = RIDE-SHARE <carpool>
17. TY PREFACE - R = TYPEFACE <Georgia?>
18. STEALING* = GENITALS <crown jewels, perhaps>
20. <plan> DESIGN = ←GIS← inside DEN
22. <salty> SALINE = "SAY LEAN"
24. IP ←DO← = IPOD <Apple product>
26. <zip> FLIT = F_L_ + IT