Stop one in some French street (6)
I believe the answer is:
desist
'stop one in some french street' is the definition.
'desist' can be an answer for 'stop' (I've seen this before). I am unsure of the 'one in some french street' bit.
'stop one in some french street' is the wordplay.
'stop' becomes 's' (this could be a standard abbreviation I've not previously seen).
'one' becomes 'I' (Roman numeral).
'in' indicates putting letters inside.
'some french' becomes 'de' ('some' in French).
'street' becomes 'st'.
's'+'i'='si'
'de'+'st'='dest'
'si' inserted into 'dest' is 'DESIST'.
Can you help me to learn more?
(Other definitions for desist that I've seen before include "Stop, cease activity" , "Stop, whoa, give over" , "Leave off (doing a thing)" , "Stop, abstain" , "Stop, don't continue" .)