Frilly neckwear fashionable worn by a bruiser (7)
I believe the answer is:
ruffian
'bruiser' is the definition.
(thesaurus)
'frilly neckwear fashionable worn by a' is the wordplay.
'frilly neckwear' becomes 'ruff' (I have seen 'Jacobean neckwear ' mean 'ruff' so perhaps 'neckwear' could also mean 'ruff'. I am not sure about the 'frilly' bit.).
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'worn by' means one lot of letters goes inside another (outside letters are worn by those on the inside).
'in' going around 'a' is 'ian'.
'ruff'+'ian'='RUFFIAN'
Can you help me to learn more?
(Other definitions for ruffian that I've seen before include "Lout" , "Funfair (anag)" , "Bully" , "Yobbo" , "Scoundrel" .)