Speed runs up getting run over (5)
I believe the answer is:
Here is my best explanation:
'run over' is the definition.
(I've seen this before)
'speed runs up' is the wordplay.
'speed' becomes 'pace' (pace is a kind of speed**).
'runs' becomes 'r' (cricket abbreviation).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'pacer' written backwards gives 'RECAP'.
'getting' acts as a link.
(Other definitions for recap that I've seen before include "Sum up what has been said", "Final summary", "Go over things again", "Say again", "Caper (anag)", "Restate", "Go over again in the mind", "Summarising statement", "Sum up (abbrev.)" and "Run through again (Inf)".)