Unblemished
by Kegler

Some clues are wordplay only; these lead to synonyms of the actual entries rather than the entries themselves.  The unclued central entry will help determine the proper synonyms.

Unblemished grid

Across
1Distribute Kleenex, first off
5Chooses zero points
9William Morris provides lead, perhaps
13Act involving lamp
15Loud as radical author Huxley
17Norm, sneaky, swallows last of olive garnish
18Sandra has pull, an overwhelming amount
19Duck, striking head with garden implement
20Ongoing story of breakfast food recited
21Overweight soul, within limits, embraced by our group
22Fool's places back East
25Rewrite my clue for “hall”
26See instructions
29In pain, eating one donut after another?
31One led by former President in dance
33Breeds asses
34Revamping robust engine enhancers
36Lawmen admitting running pool
37One with interest in railroad schedule
40As husband enters party, two females hurry away (2 wds)
42Alien pursuing foreign menu is inappropriate
43Inexperienced resident has no time
44Youngster's top number
45Backing up, taxi hit composer
46Ring contains red gem
Down
1Skybound tree's sap mixture secretes something sticky?
2Phase out form
3Uttered apology for attire
4Boosts delivery company
6Snoop is up your alley, ultimately
7Brown, green and orange drink
8Bananas, not lemons
10Mushroom stuffed with, yes, fish (2 wds)
11Australian flyer and Greek character use a straw around disheartened kid (2 wds)
12Willow looking better after middle of March
14Cowardly, you initially lie low
16Register I'd returned to clergyman's home
18Mistakenly deepen lid of early magnetometer (2 wds)
21Eats and puts on weight in the middle
23Long odds for Daniel, ditching British behind camp shelter (3 wds)
24Variable menus are something required for computer access
27Wife leaves poet Walt for murderer (2 wds)
28Band holds up ceremony
30Wild zebra consumes bit of grass in European capital
32Declaim with small pained expression
35Present strongbox missing $100
38List is nonsense, first of all
39Star of “River Rising”
40Shiny cap I crushed
41Employ no Republican, Rush

Solution