Step outside parts of Paris, France (4)
I believe the answer is:
pace
'step outside' is the definition.
'pace' can be an answer for 'step' (I've seen this before). I am not certain of the 'outside' bit.
'parts of paris france' is the wordplay.
'parts of' says to take the initial letters (I've seen 'part' mean this).
'france' becomes 'ace' (I can't explain this - if you can you should believe this answer much more).
The initial letter of 'paris' is 'p'.
'p'+'ace'='PACE'
Can you help me to learn more?
(Other definitions for pace that I've seen before include "With due respect" , "Gait" , "Stride" , "speed of movement" , "Speed of a single step?" .)