Calling after drink for end of joke (9)
I believe the answer is:
punchline
'end of joke' is the definition.
'punchline' can be an answer for 'end' (I have seen 'end of story' mean 'punchline' so perhaps 'end' could also mean 'punchline'). I am unsure of the 'of joke' bit.
'calling after drink for' is the wordplay.
'calling' becomes 'line' (I've seen this in another clue).
'after' says to put letters next to each other.
'drink for' becomes 'punch' (I can't explain this - if you can you should believe this answer much more).
'line' after 'punch' is 'PUNCHLINE'.
Can you help me to learn more?
(Other definitions for punchline that I've seen before include "bit of a joke" , "one is expected to laugh at" , "joke leading to row after church" , "end of story" , "Point" .)