Across
5 fierce FIE + R(a)CE
6 theism THE<IS>M(ass)
9 Orwell OR + WELL(s)
10 exploits EX-P(i)LO(I)TS
11 best BE(a)ST
12 airmanship A<IRISHMAN(anag)>P(ower)
13 St George cryptic def for his day (23 April)
18 Washington SAW NOTHING (anag) [initial president]
21 ogre anag of GEORge or geORGE
22 listen to LIST + NOTE (anag)
23 legend L<EG>END
24 dragon DRAG ON
25 homage HOM<AG>E [Ag = silver]
Down
1 dementia E(nglish)/MEN/T(tme) in AIR (rev) [George III]
2 Scylla SC (namely) + ALLY (rev)
3 the Prado HOPED ART (anag)
4 pilots double def [George = automatic pilot]
5 farmer FAR/M(arried)/ER [Farmer George, nickname for George III]
7 mythic MY/THIC(k)
8 segregation SAINT GEORGE (anag)
14 non-union NON-U/N(orthern)I(reland)/ON
15 Georgian GEORG(e) + IAN (Botham) [6 GR’s so far]
16 varied I’VE DRA(gon) (anag)
17 prince PRI<N(ame)>CE
19 hitman HIT + MAN (knight)
20 Nelson/nelson double def