Advocates being called here for a drink? (3,3)
I believe the answer is:
the bar
'advocates being' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'called here for a drink?' is the wordplay.
'called here' becomes 'bar' (I can't justify this - if you can you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'a drink?' becomes 'the' (I have seen 'French drink' mean 'the' so perhaps 'drink' could also mean 'the').
'bar' put after 'the' is 'THE BAR'.
Can you help me to learn more?
(Other definitions for the bar that I've seen before include "Barristers collectively" , "Legal advocates are called to it" .)