Possible Clues:

• Just past by the Beatles
• Clare proud, perhaps, following routine
• In the past, you once strayed disastrously
• Classic song of years separated by a desert, sadly
• A time when those worldly-wise were not born?
• Hit of the recent past
• Recent time
• Recently steady, rely on losing pounds with vigorous exercise
• When Paul last solved a puzzle?
• Song that's gone, but probably not forgotten?