Beautiful girl in British lifestyle magazine (5)
I believe the answer is:
belle
'beautiful girl' is the definition.
(I've seen this before)
'british lifestyle magazine' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'lifestyle magazine' becomes 'Elle'.
'b'+'elle'='BELLE'
'in' is the link.
(Other definitions for belle that I've seen before include "Pretty girl" , "Handsome lady of the Ball?" , "Most attractive girl" , "-- Epoque, before the Great War" , "Beautiful woman - of the ball?" .)