A way to fill up ten - or many more! (9)
I believe the answer is:
plentiful
'many more' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
'a way to fill up ten' is the wordplay.
'fill up ten' anagrams to 'PLENTIFUL'.
However, I am unsure how the anagram is indicated.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for plentiful that I've seen before include "Productive" , "common" , "Existing in great quantities" , "Abundant - profuse" , "Abundant, copious" .)