Integrated Bussing
by Kegler

Twenty words gain a letter before entry into the diagram; in each case, a new word is formed.
The unclued entry at 27 Across explains what is being provided.  Grid entries include five proper nouns.

Across 1 Lacking financial support, hungry, swallowing crustless buns down 8 Group ceremony 11 Nothing in river, for the most part 13 I jump to stacks' location? 14 Half of machines exhibiting speed ratio 15 Neighborhoods accommodating new theaters 16 Certain Italians remodeled manors 17 Plan encompassing one-time believers 20 Tiny whiff of daffodil or dandelion, perhaps 22 Greek character enters, returning red object 25 Quite a few not returning favors, ultimately 26 Enemies on the outskirts of fortresses 27 See instructions 30 Poet is housed in Providence 32 One who corrects Muslim prince gripping last two grains of sand 36 Brews from “The Oaks,” oddly 37 Saucer stored in cupboard is cracked 39 Female finishes with drink 40 Toured twisting, circuitous route 41 Slightly distorted premise for early arrivals 43 Nail starts to become rusted and deformed 44 Maintained by pair of legends or folk wisdom 45 Man holds one big pipe 46 Shelter in a rundown district around club 47 Prepare to dry out Senator Kennedy 48 Carol's pride, for example, starting to grow

Down 1 Lie hurt nut badly 2 Brilliant throw covers one mile 3 Marks small vehicles 4 Crazy hug engenders expression of disgust 5 Reportedly is aware of bouquet 6 Real confused nobleman 7 Dead sure, initially, stifling Republican's fears 8 Endlessly mess around in pits 9 Eureka! A high ace 10 Agile mole taking bite of radish 12 Running behind, pupil finally consumed food 18 Copper line ends prematurely after tube runs sterile liquid used to test for a disease 19 Unscrupulous outfit displays nearly worthless coin 21 At the end, forward barely gets by with fakes out on the ice 23 Ponder amount coming back by completion of sale 24 Give gang the day off to prepare racket? 26 Passing craze, Ed, died out 28 Catch half a score on the rebound 29 Truly chic accomplishment 31 Formations of geese taking right turns 33 Cruise charge reversed for squirrely one? 34 Reptile with two degrees 35 Supporter, yes, after all 38 Senselessly smite things 41 Buddy starts to pester attractive lady 42 Mel chopped up tree

Solution