Here are the possible solutions for happenings ten years time 1966 hit by the yardbirds clue
Answer
Clue
Relevancy
ago
Clue
"Happenings Ten Years Time ___" (1966 hit by the Yardbirds)
Definition
in the past
santa
Clue
"Ten times ten thousand years from now, he will continue to make glad the heart of childhood" according to a New York Sun editorial of September 21, 1897