Ended series having exceeded time allowed (7)
I believe the answer is:
'exceeded time allowed' is the definition.
I can't tell whether this definition defines the answer.
'ended series' is the wordplay.
'ended' becomes 'over' (synonyms).
'series' becomes 'run' (a run or sequence of things).
'having' acts as a link.
Can you help me to learn more?
(Other definitions for overrun that I've seen before include "Move too fast" , "Cover - attack" , "Go beyond the allotted time" , "UN rover (anag.)" , "Last longer than scheduled" .)