Crossword Genius

Dark trailer with ornate chassis? (7)

Ross

I believe the answer is:

shadowy

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

'dark' is the definition.
(similar in meaning)

'trailer with ornate chassis?' is the wordplay.
I cannot quite understand how this works, but
'trailer' could be 'ad' (short for advert) and 'ad' is found within the answer.
'with' could be 'w' (abbreviation) and 'w' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for shadowy that I've seen before include "Why soda? (anag)" , "Insubstantial" , "Mysterious" , "Obscure, dark" , "Obscure; dim" .)

I've seen this clue in The Guardian.
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