Something that needs discussing with king after OPEC obtain liquid (1,4,2,4)
I believe the answer is:
a bone to pick
'something that needs discussing' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'king after opec obtain liquid' is the wordplay.
'king' becomes 'K' (chess abbreviation).
'after' means one lot of letters go next to another.
'liquid' indicates an anagram.
'opec'+'obtain'='opecobtain'
'opecobtain' with letters rearranged gives 'abonetopic'.
'k' after 'abonetopic' is 'A BONE TO PICK'.
'with' is the link.
Can you help me to learn more?
(Other definitions for a bone to pick that I've seen before include "subject of quarrel" , "reason for tiff" , "Option for dog" , "cause of disagreement" , "an item of contention" .)