Personal Improvement solution
by Kegler

Per 28 Across, GETTING A DEGREE, eight answers add a college degree to form a new word or phrase before entry.

Personal Improvement solution grid

Across
1OBSIDIAN (rev hidden)
8LO(G)IC (CLIO anag)
12HA(YD)N
13AN + TWERP
15TAN (ANT anag)
16OM + NI (rev)
17C[A/d]ROM
18COMBATS (STOCk rev)
19LORD (hidden)
20A(DAM)S (MAD rev)
22LIT + E
24NASA (hidden)
25SCAM (rev)
27YE(A)N
28GETTING A DEGREE
31NEHI ("KNEE-HIGH" hom)
33AMPS (MAPS anag)
35I + BE + X
37V + CaRS
39TESLA (STALE anag)
41E(TN)A
42ABA + L + ONE
44CHILI ("CHILLY" hom)
45B(U)OY
46A + FT
47ALLD + ON + E
48bASSET
49S(L)AYS
50HAMSTERS (HEARST anag)
Down
2BAAED (DEB rev)
3SYNC ("SINK" hom)
4IDIOMATICALLY (OIL CITY LAID anag)
5I + AM + BIC
6AN(N)AL (LANA rev)
7TWo + ISTED (DIETS anag)
8LE(CH)ER
9ORAL HYGIENIST (EASILY RIGHT ON anag)
10IV(OR)Y
11CAMD(E)N
14PROVERBS
15TWA + NG
21AS + THEN + I + A
23IMAM (MAMIe rev)
26A + GAR
29NOC(AN + D)O (COON anag)
30EX + ACT
31NIECES (SCENE I anag)
32A(VAIL)S
34P(HL)OEM
36ETHYL ("ETHEL" hom)
38SA + U + NA
40LIFER (FLIER anag)
43lEASEs