What one needs to go beyond Dover say (8)
I believe the answer is:
passport
'what one needs' is the definition.
I can't judge whether this defines the answer.
'go beyond dover say' is the wordplay.
'go beyond' becomes 'pass' (synonyms).
'dover say' becomes 'port' (I can't explain this - if you can you should believe this answer much more).
'pass'+'port'='PASSPORT'
'to' is the link.
Can you help me to learn more?
(Other definitions for passport that I've seen before include "that may gain acceptance" , "Document allowing travel abroad" , "you might need Visa with this" , "Carte blanche" , "International identification document" .)