Sir Lancelot

[Khal6]

9) Waterproof sealant (5)
11) Preventing growth of disease (10)
15) Precede (6)
17) Bird (6)
19) Kill, put an end to (5,3)
23) Certain (10)
25) Coalesced form (9)
1) One revering religious ceremonies (14)
2) Person who runs a charity (7)
3) Dashing, disreputable quality (10)
13) Resigned philosophical statement (3,4,3)
16) Not pressed flat (8)
24) Nickname of Queen Elizabeth 1 (4)

Much obliged.

[magcrossword]

9. caulk

[Lie-in King]

All I can say is 6a!

9a Caulk
11a Antiseptic
15a Forego
17a Thrush
19a Knock off
23a Guaranteed
25a Accretion

1d Sacramentarian
2d Trustee
3d Rakishness
13d You can't win
16d Unironed
24d Bess