As a consequence, accompanying oddly slow pain in the neck (7)
I believe the answer is:
soandso
'pain in the neck' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'as a consequence accompanying oddly slow' is the wordplay.
'as a consequence' becomes 'andso' (I can't justify this - if you can you should believe this answer much more).
'accompanying' means one lot of letters go next to another.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternate letters of 'slow' are 'so'.
'andso' put after 'so' is 'SOANDSO'.
Can you help me to learn more?
(Another definition for soandso that I've seen is " Unpleasant person - whose name has been forgotten!".)