Old pals do get about with workers' association (7)
I believe the answer is:
reunion
'old pals do' is the definition.
(event or 'do' for old friends)
'about with workers' association' is the wordplay.
'about' becomes 're' (regarding).
'with' means one lot of letters go next to another.
'workers' association' becomes 'union' (I've seen this before).
're'+'union'='REUNION'
'get' acts as a link.
(Other definitions for reunion that I've seen before include "Get-together of old friends" , "French island near Mauritius" , "Meeting of old friends" , "Social gathering - French island in the Indian Ocean" , "Later meet-up" .)