Quickly produce series at a higher level
I believe the answer is:
run up
'quickly produce' is the definition.
'series at a higher level' is the wordplay.
'series' becomes 'run' (run is a kind of series).
'at a higher level' becomes 'up' (I am not sure about this - if you are sure you should believe this answer much more).
'run'+'up'='RUN-UP'
Can you help me to learn more?
(Other definitions for run up that I've seen before include "Preliminary period" , "Cricketing approach?" , "Bowler's approach" , "formed quickly" , "Preparatory period" .)