Visor from east English certainly possessed first (8)
I believe the answer is:
eyeshade
'visor' is the definition.
(I know that visor can be written as eyeshade)
'east english certainly possessed first' is the wordplay.
'east' becomes 'e' (abbreviation).
'english' becomes 'E' (abbreviation).
'certainly' becomes 'yes' (both can be used to answer in the affirmative).
'possessed' becomes 'had' (to have something is to possess it).
'first' means one lot of letters go next to another.
'yes'+'had'='yeshad'
'e' after 'yeshad' is 'yeshade'.
'e'+'yeshade'='EYESHADE'
'from' is the link.
(Other definitions for eyeshade that I've seen before include "Sun visor" , "something like CAP" , "Translucent visor" , "screen for lookers in The Sun" , "Device to protect sight from strong light" .)