Fashionable doctor caught in embrace? Nonsense! (6)
I believe the answer is:
humbug
'nonsense' is the definition.
(I know that humbug is a type of nonsense)
'fashionable doctor caught in embrace?' is the wordplay.
'fashionable' becomes 'u'.
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'caught in' means one lot of letters goes inside another.
'embrace?' becomes 'hug' (hug is a kind of embrace).
'u'+'mb'='umb'
'umb' placed within 'hug' is 'HUMBUG'.
(Other definitions for humbug that I've seen before include "Nonsense - striped sweet" , "Pretentious talk or boiled sweet" , "Dickensian kind of hypocrite" , "Noise of a bee with an insect makes a sham" , "Minty sweet" .)