Symbol English doctor associated with the Parisian Metro at first (6)
I believe the answer is:
emblem
'symbol' is the definition.
(I've seen this before)
'english doctor associated with the parisian metro at first' is the wordplay.
'english' becomes 'e' (abbreviation).
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus**).
'associated with' says to put letters next to each other.
'the parisian' becomes 'le' (definite article in French).
'at first' indicates taking the first letters.
The initial letter of 'metro' is 'm'.
'e'+'mb'+'le'+'m'='EMBLEM'
(Other definitions for emblem that I've seen before include "Badge, token" , "Typifying symbol" , "Symbolic object" , "Device, badge or symbol" , "Symbol, representative device" .)