Tradesmen partly reversed across red light (7)

I believe the answer is:

gilders

I'm a little stuck... Click here to teach me more about this clue!

'tradesmen' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe they are linked in a way I don't understand?

'partly reversed across red light' is the wordplay.
'reversed' says the letters should be written in reverse.
'partly' indicates a hidden word (part of the clue is used).
'sredlig' can be found hidden inside 'across red light'.
'sredlig' in reverse letter order is 'GILDERS'.

Can you help me to learn more?

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.