Wide secondary route? (5)

I believe the answer is:

broad

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'wide' is the definition.
('broad' can be a synonym of 'wide')

'secondary route?' is the wordplay.
'secondary' becomes 'b' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'route?' becomes 'road' ('road' can be a synonym of 'route').
'b'+'road'='BROAD'

Can you help me to learn more?

(Other definitions for broad that I've seen before include "Covering a wide range" , "dame" , "River expansion" , "Without detail; wide" , "not detailed" .)

I've seen this clue in The Telegraph.

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