Hold on to it if you want to deal with legal profession (9)
I believe the answer is:
handlebar
'hold on to it if you want' is the definition.
I can't judge whether this defines the answer.
'deal with legal profession' is the wordplay.
'deal with' becomes 'handle' (synonyms).
'legal profession' becomes 'bar' (synonyms).
'handle'+'bar'='HANDLEBAR'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for handlebar that I've seen before include "part for rider to grip" , "used by bikers" , "Moustache like one on a bicycle" , "Biker uses this" , "Kind of moustache (for a cyclist?)" .)