Possible Clues:

• Shady, as a street
• *Like the National Mall
• Like a shady boulevard ... and like this puzzle, in terms of its 12 border answers
• Lifetime appears to be so 'growth-restricted'
• '. . . drove rapidly through the peaceful, — suburban area' (Robert Ludlum, The Holcroft Covenant)
• Like an avenue perhaps
• Like many a New England street
• English in time ruled again, having retained the Ashes all along?
• Like most avenues
• Like many avenues