Fibre shown by little girl confronting gangster? (5)
I believe the answer is:
sisal
'fibre' is the definition.
(I know that sisal is a type of plant fiber)
'little girl confronting gangster?' is the wordplay.
'little girl' becomes 'sis' (short for sister).
'confronting' is a charade indicator (letters next to each other).
'gangster?' becomes 'al' (Al Capone).
'sis'+'al'='SISAL'
'shown by' acts as a link.
(Other definitions for sisal that I've seen before include "Agave rope-fibre" , "Fibre of Mexican agave" , "Rope-fibre made from leaves of tropical plant" , "Fibre from agave plant" , "Agave fibre found in bad sails" .)