View, at length, a street in the Roman way (5)
I believe the answer is:
vista
'view at length' is the definition.
'vista' can be an answer for 'view' (I've seen this before). I'm not certain of the 'at length' bit.
'a street in the roman way' is the wordplay.
'a street' becomes 'st' (abbreviation).
'in the' means one lot of letters goes inside another.
'roman way' becomes 'via' (term for a street in Italian eg in Rome).
'st' going into 'via' is 'VISTA'.
Can you help me to learn more?
(Other definitions for vista that I've seen before include "Panoramic scene" , "View (with avenue)" , "Panoramic view" , "Broad prospect" , "One gives a long look" .)