What one needs to go beyond Dover perhaps (8)
I believe the answer is:
passport
'what one needs' is the definition.
I can't tell whether this defines the answer.
'go beyond dover perhaps' is the wordplay.
'go beyond' becomes 'pass' (synonyms).
'dover perhaps' becomes 'port' (Dover is an English port).
'pass'+'port'='PASSPORT'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for passport that I've seen before include "It could be important on holiday" , "Official document required for foreign travel" , "Travel authorisation" , "Official document required for international travel" , "Document facilitating travel" .)