Daring performances wow banks of theatregoers (6)
I believe the answer is:
stunts
'daring performances' is the definition.
(dangerous or daring feats)
'wow banks of theatregoers' is the wordplay.
'wow' becomes 'stun' (wow can mean to stun or astonish).
'banks of' suggests removing the centre (the banks are the sides of the word).
'theatregoers' with its middle removed is 'ts'.
'stun'+'ts'='STUNTS'
(Other definitions for stunts that I've seen before include "Prevents further development" , "spectacular performances" , "Hinders the growth of, like tricks" , "Checks growth or development" , "Exploits, feats" .)