Record that winning runner might break? (4)
I believe the answer is:
tape
'record' is the definition.
(taping record is a kind of recording)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tape that I've seen before include "Music cassette" , "Race finishing line strip" , "Race winning line; record" , "Band" , "Adhesive --; red --" .)