Crossword Genius

Lakes are not major highways (6)

Ross

I believe the answer is:

broads

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

'lakes' is the definition.
Although both the answer and definition are plural nouns, I cannot see how they can define each other.

'not major highways' is the wordplay.
'not major' becomes 'b' (I can't justify this - if you can you should believe this answer much more).
'highways' becomes 'roads' (I've seen this in another clue).
'b'+'roads'='BROADS'

'are' is the link.

Can you help me to learn more?

(Other definitions for broads that I've seen before include "found in part of eastern England" , "Old coins" , "Wetland" , "Norfolk holiday area" .)

I've seen this clue in the Evening Standard.
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