Disloyal, jump when someone goes too quickly (5,5)
I believe the answer is:
false start
'someone goes too quickly' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'disloyal jump' is the wordplay.
'disloyal' becomes 'false' (associated in meaning).
'jump' becomes 'start' (as in starting or jumping in fear).
'false'+'start'='FALSE START'
'when' acts as a 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" , "Unsuccessful beginning" , "In which runner is seen to have jumped the gun" .)