(Each response here will be spelled entirely with letters in the word "circle")
Enchantress who made Odysseus' men pig-headed
Circe
It straightens the arm at the elbow
The tricep
Sherlock's big brother, he could be found every evening at the Diogenes Club
Mycroft
Is panda carnivore, omnivore or herbivore?
Herbivore
Take this toy I use to "walk the dog"; I tried that "warp drive" trick, & now I'm in traction
a yo-yo
Last name of the lyricist who worked with Andrew Lloyd Webber
Rice
Swimming, cycling & running all in one event
A triathlon
Charles Dickens rose to fame with "The Posthumous Papers of" this "Club"
Pickwick
Is an apple treeflowering or nonflowering plant?
Flowering Plant (Angiosperm)
Take this crossbar with 2 U-shaped pieces; my oxen are on strike, & they refuse to wear it
a yoke
Its name is from the Middle English for "an object of religious veneration"
A relic
The period that lasted from about 250 million to 200 million years ago
Triassic
A 1989 bestseller begins, "My father has asked me to be the fourth corner at" this
the Joy Luck Club
Is pizza homogeneous or heterogeneous mixture?
Heterogeneous mixture
Take this pack animal I brought back from Asia; it grunts so much I can't sleep at night
a yak
To cause annoyance or ire
To rile
From the Latin for "platform for magistrates", it's a court of justice
Tribunal
7th graders Kristy, Mary Anne, Claudia & Stacey founded this club in a 1986 kids novel; around 250 titles later, it's still in business
the Baby-Sitters Club
Is butterfly vertebrate or invertebrate?
Invertebrate
Take this role in "Fiddler on the Roof"; I wanted to play it, but Bea Arthur's old Broadway costume doesn't fit me
Yenta
In many fantasy role-playing games, it's a healing class
a Cleric
A group of 3 men collectively responsible for the administration of ancient Rome
Triumvirate
Lord Peter Wimsey frequents the Egotists' Club in mystery stories by this woman
Dorothy L. Sayers
Is bird viviparous or oviparous?
Oviparous
(...) is an extremely poetic way to refer to the past. You might nostalgically talk about the town where you used to live as your home of THIS
Yesteryear