Symbol English doctor associated with the Parisian Metro at first (6)
I believe the answer is:
Here is my best explanation:
'symbol' is the definition.
(emblem is a kind of symbol)
'english doctor associated with the parisian metro at first' is the subsidiary indication.
'english' becomes 'e' (abbreviation).
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus**).
'associated with' is a charade indicator (letters next to each other).
'the parisian' becomes 'le' (definite article in French).
'at first' suggests taking the first letters.
The initial letter of 'metro' is 'm'.
(Other definitions for emblem that I've seen before include "Device, badge or symbol", "Crest or symbol", "Typifying symbol", "Badge; symbol", "Representative object", "Badge, token", "Symbol or hallmark", "Crest or insignia", "Symbol, device that represents something" and "Badge or representative device".)