At last, ref's blown for infringement (5,5)
I believe the answer is:
false start
'infringement' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'at last ref's blown' is the wordplay.
'blown' is an anagram indicator (to blow can mean to disrupt or scatter).
'at'+'last'+'refs'='atlastrefs'
'atlastrefs' anagrammed gives 'FALSE START'.
'for' is the link.
Can you help me to learn more?
(Other definitions for false start that I've seen before include "may lead to total recall" , "In which someone jumps the gun" , "In which runner is seen to have jumped the gun" , "Unsuccessful beginning" .)