Very many lacking purpose? (7)
I believe the answer is:
endless
I believe this clue is a double definition.
'very many' is the first definition.
(endless list of items means huge numbers)
'lacking purpose?' is the second definition.
(an end can be a purpose)
(Other definitions for endless that I've seen before include "Continuous - eternal - incessant" , "permanent" , "Eternal - unbroken" , "Infinite, perpetual" , "Unceasing" .)