A minor way abroad is as wide as possible (8)

I believe the answer is:

broadest

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'a minor way abroad is' is the definition.
I can't tell whether this defines the answer.

'wide as possible' is the wordplay.
'wide' becomes 'broad' (synonyms).
'as possible' becomes 'est' (I am not sure about this - if you are sure you should believe this answer much more).
'broad'+'est'='BROADEST'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for broadest that I've seen before include "Most unspecific" , "Widest" , "Most general, extensive" .)

I've seen this clue in The Times.

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