Lawyer thus allowed into bar at last (9)
I believe the answer is:
solicitor
'lawyer' is the definition.
(solicitor is a kind of lawyer)
'thus allowed into bar at last' is the wordplay.
'thus' becomes 'so' ('so' can be a synonym of 'thus').
'allowed' becomes 'licit' (I've seen this before).
'at last' suggests the final letters.
The final letters of 'into bar' are 'or'.
'so'+'licit'+'or'='SOLICITOR'
(Other definitions for solicitor that I've seen before include "Legal advisor" , "beggar" , "court officer" , "legal expert" , "Legal representative" .)