Seeing sense, prophet becomes tourist (9)
I believe the answer is:
sightseer
'tourist' is the definition.
(sightseer is a kind of tourist)
'seeing sense prophet' is the wordplay.
'seeing sense' becomes 'sight' (sighting is a kind of sensing).
'prophet' becomes 'seer' (I've seen this before).
'sight'+'seer'='SIGHTSEER'
'becomes' is the link.
(Other definitions for sightseer that I've seen before include "Visitor to famous locations" , "Tripper" , "Tourist visiting scenes of interest" , "Rubberneck" .)