Athletes performing at parade attract the most attention (5,3,4)
I believe the answer is:
steal the show
'attract the most attention' is the definition.
(I've seen this before)
'athletes performing at parade' is the wordplay.
'performing' is an anagram indicator.
'at parade' becomes 'show' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'athletes' anagrammed gives 'stealthe'.
'stealthe'+'show'='STEAL THE SHOW'
Can you help me to learn more?
(Other definitions for steal the show that I've seen before include "Attract the most admiration" , "Unexpectedly emerge as the outstanding performer" , "capture everyone's attention" , "Attract the most attention and praise" , "Draw most attention and praise" .)