Modern area in old city finally showing some control of traffic (3-3)
I believe the answer is:
one-way
'some control of traffic' is the definition.
I can't judge whether this defines the answer.
'modern area in old city finally' is the wordplay.
'modern' becomes 'new' (synonyms).
'area' becomes 'a' (maths abbreviation).
'in' means one lot of letters goes inside another.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'finally' indicates one should take the final letters.
The last letter of 'city' is 'y'.
'new'+'a'='newa'
'o'+'y'='oy'
'newa' inserted inside 'oy' is 'ONE-WAY'.
'showing' is the link.
Can you help me to learn more?
(Other definitions for one-way that I've seen before include "Like non-return valve" , "Kind of street where cars shouldn't meet head-on" , "Allowing travel in one direction only" , "This street is single-directional" , "This street allows only single traffic flow" .)