Understanding, mean to go back and have a drink with (7)
I believe the answer is:
rapport
'understanding' is the definition.
(thesaurus)
'mean to go back and have a drink with' is the wordplay.
'mean' becomes 'par' (I've seen this before).
'to go back' says the letters should be written in reverse.
'and' means one lot of letters go next to another.
'have a drink with' becomes 'port' (I am not sure about this - if you are sure you should believe this answer much more).
'par' backwards is 'rap'.
'rap'+'port'='RAPPORT'
Can you help me to learn more?
(Other definitions for rapport that I've seen before include "Feeling of mutual understanding" , "Emotional bond" , "Sympathetic relationship" , "Bond of sympathy" , "Harmonious understanding with someone" .)