Follow a Parisian boarding carrier (5)
I believe the answer is:
hound
'follow' is the definition.
(thesaurus)
'a parisian boarding carrier' is the wordplay.
'a parisian' becomes 'un'.
'boarding' means one lot of letters goes inside another.
'carrier' becomes 'hod' (I've seen this before).
'un' put within 'hod' is 'HOUND'.
(Other definitions for hound that I've seen before include "Breed of dog used for hunting" , "Chase after" , "Harry" , "Follow" , "part of hunt" .)