Traditional social event is unfortunately canned by lawyers (4,5)
I believe the answer is:
barn dance
'traditional social event' is the definition.
'barn dance' can be an answer for 'event' (I have seen 'Social event' mean 'barn dance' so perhaps 'event' could also mean 'barn dance'). I'm not sure about the 'traditional social' bit.
'unfortunately canned by lawyers' is the wordplay.
I cannot quite see how this works, but
an anagram of 'canned' is 'ndance' which is present in the answer.
'lawyers' could be 'bar' (the bar can mean the legal profession) and 'bar' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'is' is the link.
Can you help me to learn more?
(Other definitions for barn dance that I've seen before include "Hoedown" , "Country entertainment" , "Rural entertainment" , "Country social gathering" , "Kind of social event with traditional music" .)