Visit registered prophet (4)
I believe the answer is:
seer
'prophet' is the definition.
(both can mean someone who tells the future)
'visit registered' is the wordplay.
'visit' becomes 'see' (synonyms).
'registered' becomes 'R' (abbreviation, as in registered trademark).
'see'+'r'='SEER'
(Other definitions for seer that I've seen before include "One fortelling future" , "One who knows the future" , "Person who can read the future" , "Wise person" , "Oracle or prophet" .)