Close street: work is to follow (4)
I believe the answer is:
stop
'close' is the definition.
(close can mean to stop or come to an end)
'street work is to follow' is the wordplay.
'street' becomes 'st' (abbreviation).
'work' becomes 'op' (common abbreviation for 'opus').
'is to follow' means one lot of letters go next to another (some letters go after or follow others).
'st'+'op'='STOP'
(Other definitions for stop that I've seen before include "period in US" , "port of call" , "Plug; cease" , "Plug - organ knob - bus halt - period" , "Cease, desist, whoa" .)