Apprehended in Chartres, passing by to enter without permission (8)
I believe the answer is:
trespass
'enter without permission' is the definition.
(I've seen this before)
'apprehended in chartres passing by' is the wordplay.
'apprehended in chartres' becomes 'tres' (I can't justify this - if you can you should believe this answer much more).
'passing' becomes 'pass' (synonyms).
'by' is a charade indicator (letters next to each other).
'tres'+'pass'='TRESPASS'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for trespass that I've seen before include "Intrude, encroach" , "Commit a sin -- spa's rest (anag)" , "sin in the eyes of the church" , "Unlawful entry to someone's property" , "Action of intruder" .)