Across
1 helical: HE + I CALL (anag)
5 trachea: cleopaTRA CHEAted (hidden)
9 riven: (d)RIVEN
10 coriander: COR (my) + DEAR IN (anag)
11 surprising: (talk)S + U<R(ebel)>PRISING
12 tale: T(ake)/A/L(ittle)/C(urry)
14 belligerent: BELL<GI(rev)>E + RENT
18 colonoscopy: COLON (:) + S0 (rev)/COPY
21 rapt@ wrapped (hom)
22 drawbridge: DRAW + BRIDGE
25 foresters: FOR + ESTERS
26 troll: double def [Billy Goats Gruff’s opponent]
27 lip balm: 1/P(u)B in MALL (anag)
28 ecdysis: DISC YES (anag)
Down
1 heresy: HERE’S + why (hom)
2 livery: (de)LI/VERY
3 contraband: CARTON (anag) + B(urst)/AND
4 locus: LOCUS(t)
5 Tarantino: (s)TAR + NATION (anag)
7 hydrated: DRY DEATH (anag)
8 apricity: APR 1 (April Fool’s Day) + CITY
13 dehydrated: HYDRA/T(witch) in DEED
15 laser beam: A/SERB in MEAL (anag)
16 scornful: (p)R(o)F(a)N(e)/LOCUS (anag)
17 claptrap: CLAP + PART (rev)
19 odious: (mel)ODIOUS
20 realms: RE/ALMS
23,6 waste away: TEA in WAS/WAY
24 Asia: (byp)AS(sed)/(qu)I(et)/(b)A(y)