Be a tourist with sense to understand (8)
I believe the answer is:
sightsee
'be a tourist' is the definition.
(I've seen this before)
'with sense to understand' is the wordplay.
'with' means one lot of letters go next to another.
'sense' becomes 'sight' (sighting is a kind of sensing**).
'to understand' becomes 'see' ('see' can be a synonym of 'understand').
'sight' put next to 'see' is 'SIGHTSEE'.
(Other definitions for sightsee that I've seen before include "Visit interesting places" , "take in views" , "Visit places of interest" , "What a tourist does with vision" , "do this in a tourist spot" .)