Daring case of pinchpenny pocketing fortune (6)
I believe the answer is:
plucky
'daring' is the definition.
(thesaurus)
'case of pinchpenny pocketing fortune' is the wordplay.
'case of' says to hollow out the word (remove centre letters) (outsides of).
'pocketing' means one lot of letters goes inside another.
'fortune' becomes 'luck' (synonyms).
'pinchpenny' with its centre taken out is 'py'.
'py' going around 'luck' is 'PLUCKY'.
(Other definitions for plucky that I've seen before include "Game" , "stout" , "Determined, courageous" , "Doughty" , "Brave in English way" .)