Little bit of jingoism alleged (5)
I believe the answer is:
small
'little' is the definition.
(I know that little can be written as small)
'bit of jingoism alleged' is the wordplay.
'bit of' indicates the answer is hidden within the clue.
'SMALL' is hidden in the letters of 'jingoism alleged'.
(Other definitions for small that I've seen before include "Tiny" , "of little significance" , "Social chat" , "Of little size" , "Insignificant; young" .)