Crossword Genius

Wide, albeit secondary highway (5)

Ross

I believe the answer is:

broad

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

'wide' is the definition.
(synonyms)

'albeit secondary highway' is the wordplay.
I cannot really see how this works, but
'highway' could be 'road' (highway is a type of road) and 'road' is located in the answer.
A single letter 'b' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for broad that I've seen before include "dame" , "not detailed" , "River expansion" , "Board (anag.)" , "Open" .)

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