He may be seen at the courts practising (9)
I believe the answer is:
barrister
'he may be seen at the courts practising' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he may be seen at the' is the wordplay.
I cannot really understand how this works, but
'he' could be 'barris' and 'barris' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for barrister that I've seen before include "member of an inn" , "American lawyer" , "Legal representative" , "A bewigged legal eagle" , "Lawyer for the higher courts" .)