Professional impression is met without the writer (7)
I believe the answer is:
dentist
'professional' is the definition.
(dentist is a kind of professional)
'impression is met without the writer' is the wordplay.
'impression' becomes 'dent' (dent is a kind of impression**).
'without' suggests deleting specific letters.
'the writer' becomes 'me' (the person who is writing these clues).
'met' with 'me' taken out is 't'.
'dent'+'is'+'t'='DENTIST'
(Other definitions for dentist that I've seen before include "Someone who drills for a living?" , "Repairer of teeth" , "Tooth surgeon" , "part of the medical team" , "Treatment provider for teeth" .)