Plucky banks removed fortune (4)
I believe the answer is:
luck
'fortune' is the definition.
(I know that fortune can be written as luck)
'plucky banks removed' is the wordplay.
'banks removed' means to look at the middle letters.
The centre of 'plucky' is 'LUCK'.
(Other definitions for luck that I've seen before include "''The devil''s children has the devil's ....'" , "Chance, fate, fortune" , "'Fortune, fate (4)'" , "Good or bad fortune" , "See 1" .)