Do some sightseeing in French city briefly
I believe the answer is:
tour
'do some sightseeing' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'french city briefly' is the wordplay.
'french city' becomes 'tours' (I've seen this before).
'briefly' means to remove the last letter.
'tours' with its last letter removed is 'TOUR'.
'in' is the link.
Can you help me to learn more?
(Other definitions for tour that I've seen before include "Drive" , "... de France is a multi-stage cycle race" , "Journey to visit places of interest" , "Short trip; spell of duty" , "Period of duty" .)