Star of the Show solution
by Kegler

As indicated by 22 Across, LEADING MAN, nine answers have MAN appended to the front to become new words prior to entry.

Star of the Show solution grid

Across
1MIDDLE C (musiCians)
6I + bAMBI
9ANISE (hidden)
10MANSA(R)D
13TARD + Y (DART anag)
15GEL (LEG anag)
17CARThAGE
18MANTIS (rev)
19MPG (1st letters)
20MINU(E,T)S
22LEADING MAN
24MANG + ROVE
25ANOA (hidden)
30MOWN ("MOAN" hom)
31RASSLE (LASERS anag)
32SH(A + P)ED
33I + DEAL
35A + DULl + T
36COR(O)NET
37L + ODE
38MAND + RAKE
Down
1MANGOt
2INTERPLAY (PARTY LINE anag)
3DIAL + OG (rev)
4L + ED
5CAR(A)T
6IN + FRINGE
7MANAG + E
8ID(L)ERS (DRIES anag)
11kSA + TSUM + A (rev)
12RIGHT NOW ("NIGHT ROW" spoonerism)
14RUMMAGE SALE (A SUMMER GALE anag)
16MANDR + ILL
19M(EMOR + I)AL (rev)
21IN + VA + S(I)ON
23MANDATE (2 defs)
26NOPE (PEON anag)
27PSEUD (DUPES anag)
28ME + C + CA
29T(H)IRD (DIRT anag)
30MANOR (2 defs)
34LEK (hidden)