Bar has rum - boil, stirring, to infuse (7)
I believe the answer is:
abolish
'stirring to infuse' is the definition.
I can't judge whether this definition defines the answer.
'bar has rum boil' is the wordplay.
'bar' becomes 'ash' (I am not sure about this - if you are sure you should believe this answer much more).
'has' indicates putting letters inside.
'rum' indicates an anagram (rum can mean strange or unusual).
'boil' anagrammed gives 'boli'.
'ash' enclosing 'boli' is 'ABOLISH'.
Can you help me to learn more?
(Other definitions for abolish that I've seen before include "Put an end to, as with slavery" , "Scrap" , "Formally do away with" , "Put an end to (custom)" , "Put an end to, cancel" .)