Article runs in sock, last to go previously (8)
I believe the answer is:
hitherto
'previously' is the definition.
(I've seen this before)
'article runs in sock last to' is the wordplay.
'article' becomes 'the' (the definite article in English).
'runs' becomes 'r' (cricket abbreviation).
'in' is an insertion indicator.
'sock last' becomes 'hi' (I am not sure about this - if you are sure you should believe this answer much more).
'the'+'r'='ther'
'hi'+'to'='hito'
'ther' placed within 'hito' is 'HITHERTO'.
'go' is the link.
Can you help me to learn more?
(Other definitions for hitherto that I've seen before include "Heretofore (8" , "Up till now" , "Up to this time" , "Previously" , "So far" .)