Yours truly will entertain poet, being a person of fashion (7)
I believe the answer is:
modiste
'a person of fashion' is the definition.
(someone who makes fashionable clothes)
'yours truly will entertain poet' is the wordplay.
'yours truly' becomes 'me'.
'will entertain' means one lot of letters goes inside another (entertain can mean to host or welcome in).
'poet' becomes 'odist' (someone writing odes).
'me' going around 'odist' is 'MODISTE'.
'being' is the link.
(Other definitions for modiste that I've seen before include "old dressmaker" , "Fasionable dressmaker" , "couturier" , "Posh milliner or dressmaker" .)