Mischievous journey up Parisian street is entertaining (5)
I believe the answer is:
rogue
'mischievous journey up parisian street is entertaining' is the definition.
I can't judge whether this definition defines the answer.
'journey up parisian street is entertaining' is the wordplay.
'journey' becomes 'go' (journey means to go or travel).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'parisian street' becomes 'rue' ('street' in French).
'is entertaining' is an insertion indicator.
'go' in reverse letter order is 'og'.
'og' placed within 'rue' is 'ROGUE'.
Can you help me to learn more?
(Other definitions for rogue that I've seen before include "Scally" , "Wild animal living apart from herd, say elephant" , "Baddy" , "Prankster" , "Scoundrel, knave" .)