Foolhardy to take Cockney woman’s bit of bacon (6)
I believe the answer is:
rasher
'bit of bacon' is the definition.
(a rasher is a piece of bacon)
'foolhardy to take cockney woman's' is the wordplay.
'foolhardy' becomes 'rash' (synonyms).
'to take' is a charade indicator (letters next to each other).
'cockney woman' becomes ''er' ('her' - her refers to a woman - said with a cockney accent, dropping the 'H').
'rash'+'er'='RASHER'
(Other definitions for rasher that I've seen before include "more hastily done" , "Less circumspect" , "More imprudent" , "breakfast selection?" , "Sliver of bacon" .)