Run through green light then stop sign (5)
I believe the answer is:
gored
'stop sign' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs can occasionally mean the same thing.
'run through green light' is the wordplay.
I cannot really see how this works, but
'run' could be 'go' (both can mean to function or work) and 'go' is found within the answer.
'light' could be 'red' (red light is a kind of light) and 'red' is present in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'then' is the link.
Can you help me to learn more?
(Other definitions for gored that I've seen before include "like an unfortunate matador?" , "having a puncture?" , "Pierced by bull's horns" , "Pierced - blush (can be 5 or 2,3)" , "Wounded by bull's horns" .)