Street covered by writer has small restaurant (6)
I believe the answer is:
bistro
'small restaurant' is the definition.
(I've seen this before)
'street covered by writer' is the wordplay.
'street' becomes 'st' (abbreviation).
'covered by' indicates putting letters inside.
'writer' becomes 'biro' (type of pen, something which writes).
'st' placed inside 'biro' is 'BISTRO'.
'has' is the link.
(Other definitions for bistro that I've seen before include "Small restaurant - robs it (anag)" , "Cafe bar" , "Cheap restaurant" , "Eating place" , "Small inexpensive eatery" .)