More than 1,000 keys all jumbled up (5)
I believe the answer is:
mixed
'jumbled up' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for mixed that I've seen before include "Miscellaneous" , "Varied" , "Assorted" , "For both sexes" , "Blended" .)