Tripper, one entering French town at end of August (7)
I believe the answer is:
tourist
'tripper' is the definition.
(I've seen this before)
'one entering french town at end of august' is the wordplay.
'one' becomes 'i' (Roman numeral).
'entering' indicates putting letters inside.
'french town' becomes 'Tours' (French city).
'at end of' indicates one should take the final letters.
The last letter of 'august' is 't'.
'i' going within 'tours' is 'touris'.
'touris'+'t'='TOURIST'
(Other definitions for tourist that I've seen before include "Visiting sightseer" , "Cheap travel class" , "Holiday traveller" , "Someone who travels for pleasure" , "someone on holiday" .)