Crossword Genius

Secondary highway, but wide (5)

Ross

I believe the answer is:

broad

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'wide' is the definition.
(synonyms)

'secondary highway' is the wordplay.
'secondary' becomes 'b' (I can't justify this - if you can you should believe this answer much more).
'highway' becomes 'road' (highway is a type of road).
'b'+'road'='BROAD'

'but' is the link.

Can you help me to learn more?

(Other definitions for broad that I've seen before include "Covering a wide range" , "River expansion" , "East Anglian waterway" , "not detailed" , "dame" .)

I've seen this clue in the Evening Standard.
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