Here are the possible solutions for guide and protector clue
Answer
Clue
Relevancy
shepherd
Clue
Guide and protector
juno
Clue
Roman goddess, protector of women and marriage
mouthguard
Clue
Teeth-and-gums protector
nerdy
Clue
Like someone wearing taped eyeglasses and a pocket protector
Definition
socially inept, also NURDY, NURDISH, NERDISH
rentacop
Clue
Brave protector of Claire's Boutique and Sbarro
spca
Clue
Protector of stray cats and dogs, for short
elementsofstyle
Clue
With "The," classic writing guide (and this puzzle's title)
kennyg
Clue
"For his contributions to jazz, ___ should be smeared with bacon grease, placed in a cage with three underfed Kodiak grizzly bears, and whatever happens, happens." ("Genius Guide to Jazz")