Bringing Good Cheer solution
by Kegler

As indicated by the phrase LIFTING SPIRITS, the other ten unclued entries are synonyms for "spirit", entered bottom to top.   From left to right:
DOPPELGANGER, DEMON, SPOOK, APPARITION, WRAITH, SPECTER, GHOST, POLTERGEIST, PHANTOM, and SHADE.

Bringing Good Cheer solution grid

Across
1R(U,L)ING
5OPT + I + MA (POT anag; AM rev)
8dECO(NOM)Y
9PISTOL (PILOTS anag)
10NOTIFIES (IF ON-SITE anag)
11N + ONETS (STENO rev)
12W(A)HINE
13AM + Y
14LIFTING
16E(A)R
17GENT (hidden)
19fRIGHT
20KO + AL + ABE + A + R (OK rev)
22wELK
23SPIRITS
24EWE ("YOU" hom)
26PR + OS
27PA(W)N
28CITED (EDICT anag)
29PROP + AGATE
31O(PP + ONE)NT (NOT anag)
32NOS + H (SON rev)
33DIS + TA(S)TE
34SOP + HS
Down
2LO(ON)Y
3INTEL (LET IN anag)
4F,Y + I
6PI + SA
7AL(B)ERT + A
9PEW + I + T
15FOLI + AGES (FOIL anag)
18TOmS + SPOT
21AS(I) + AN
25WE + L + SH
30cAnNoT