Leave bit of audio kit after last month (6)
I believe the answer is:
decamp
'leave' is the definition.
(I know that decamp is a more specific form of the action depart)
'bit of audio kit after last month' is the wordplay.
'bit of audio kit' becomes 'amp' (I can't explain this - if you can you should believe this answer much more).
'after' says to put letters next to each other.
'last month' becomes 'dec' (short for December, last month of the year).
'amp' after 'dec' is 'DECAMP'.
Can you help me to learn more?
(Other definitions for decamp that I've seen before include "Split" , "scarper!" , "Make sudden breakaway" , "Run away (from responsibility)" , "Leave suddenly" .)