Costly solution
by Kegler

Six answers lose an ARM and another six lose a LEG before entry.

Costly solution grid

Across
1O + B(S)ESS
6jUMPING
11PRI(VILE + G)ES
13PO(WE)LL
15D(ANN)ON
17TEA (hidden)
18WA(S)N'T
19LE(GEN)DS
21MAR + MOTS (MOST anag)
23KNIT ("NIT" hom)
24UNWARMED (A MUD WREN anag)
26SWA(eRMINe)G
27U + RNS
28ALLEGES ("A LEDGE IS" hom)
31HER + B
32LEVEL (hidden)
34LE(GAT)E
36I + DEALS
37TRUS(T)S
39PEG + nASUS (SUSAn rev)
40TENSES (2 defs)
41ROMAN ARMY (rev hidden)
Down
1OP(PRES)S
2BRO (ROB anag)
3EVEN (rev)
4S(I + LT)ING
5SELENIUM (ISLE MENU anag)
6U + SDA (rev)
7PA + NAM (MAN rev)
8L(EG)IONS
9NEON TETRA (NET NEAR TO anag)
10GAR + ME(N)TS (RAG rev)
12PA(W)N
14WE(D + GI)E
16KNOW + L + EDGE (WONK rev)
20ST(R)UTTER
22OWLETS (TOWELS anag)
24UND(E)RGO (GROUND anag)
25DEBUSSY (ED'S BUSY anag)
28ALAR + M(IS)T
29SEALS (2 defs)
30LE(GAL)LY (YELL anag)
33VEIN ("VAIN" hom)
34wASPS
35GU(A)M
38TUN (rev)