The street and French, leave it written as it is (4)
I believe the answer is:
stet
'it written as it is' is the definition.
The definition suggests a singular noun which matches the answer.
'the street and french' is the wordplay.
'the street' becomes 'st' (abbreviation).
'and french' becomes 'et' ('and' in French).
'st'+'et'='STET'
'leave' acts as a link.
Can you help me to learn more?
(Other definitions for stet that I've seen before include "Notation for let spelling stand, don't change it" , "Leave as is - don't amend" , "Ignore instruction to change" , "Let it stand (on proofs)" , "Let it stand (editing mark)" .)