Undaunted, I say 'Fancy Cher coming round!' (6)
I believe the answer is:
heroic
'undaunted' is the definition.
(I've seen this before)
'i say fancy cher coming round' is the wordplay.
'i say' becomes 'oi' (both are expressions of shock or outrage).
'fancy' is an anagram indicator.
'coming round' indicates putting letters inside.
'cher' with letters rearranged gives 'herc'.
'oi' placed inside 'herc' is 'HEROIC'.
(Other definitions for heroic that I've seen before include "Showing extreme courage" , "Extravagant" , "Dramatic" , "Like a brave man" , "larger than life" .)