Related Clues:

• Not quite legit
• Like an elm-lined street
• Like a tree-lined path
• Nonkosher
• Unclean, like non-kosher food
• Not licit
• Blocked from sunlight
• Not quite on the up-and-up
• Illicit
• Not to be done
• Dubious
• Of ill repute
• Not conforming to dietary laws
• Unlawful
• Like a tree-lined street