Wise guy initially stayed with a friend in Paris (5)
I believe the answer is:
swami
'wise guy' is the definition.
(I've seen this in another clue)
'initially stayed with a friend in paris' is the wordplay.
'initially' suggests taking the first letters.
'a friend in paris' becomes 'ami' (I've seen this in another clue).
The initial letters of 'stayed with' is 'sw'.
'sw'+'ami'='SWAMI'
(Other definitions for swami that I've seen before include "Hindu holy man" , "Religious leader" , "Hindu leader" , "Teacher abroad" , "Religious master" .)