Way factory gives reason for stop-go procedure (9)
I believe the answer is:
roadworks
'reason for stop-go procedure' is the definition.
I know nothing about this answer so I can't tell whether this works.
'way factory' is the wordplay.
'way' becomes 'road' (road is a kind of way).
'factory' becomes 'works' (I've seen this before).
'road'+'works'='ROADWORKS'
'gives' acts as a link.
Can you help me to learn more?
(Other definitions for roadworks that I've seen before include "reason for traffic hold-up" , "They hold traveller up" , "What delay motorists" , "holding up travellers" , "Street repairs" .)