Initially able, drunken driver completed the course (7)
I believe the answer is:
arrived
'completed the course' is the definition.
The definition and answer can be both to do with social activities as well as being past participle verbs.
Perhaps there's a link between them I don't understand?
'initially able drunken driver' is the wordplay.
'initially' indicates taking the first letters.
'drunken' indicates anagramming the letters.
The initial letter of 'able' is 'a'.
'driver' with letters rearranged gives 'rrived'.
'a'+'rrived'='ARRIVED'
Can you help me to learn more?
(Other definitions for arrived that I've seen before include "Reached a destination" , "completed the journey" , "A driver (anag.)" , "Came" .)