Professional who can work on either half of suitcase (6)
I believe the answer is:
lawyer
'professional' is the definition.
(I know that lawyer is a type of lawyer)
'work on either half of suitcase' is the wordplay.
'work' becomes 'w' (physics abbreviation).
'on' is an insertion indicator.
'either half of suitcase' becomes 'layer' (I can't justify this - if you can you should believe this answer much more).
'w' put into 'layer' is 'LAWYER'.
'who can' acts as a link.
Can you help me to learn more?
(Other definitions for lawyer that I've seen before include "One gives legal advice" , "One provides legal advice" , "court worker" , "barman" , "Solicotor or barrister" .)