Crossword Genius

What traveller takes proper food? (12)

Ross

I believe the answer is:

thoroughfare

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'proper food?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'what traveller' is the wordplay.
'what' becomes 'thorough' (I can't justify this - if you can you should believe this answer much more).
'traveller' becomes 'fare' (fare is a kind of traveller).
'thorough'+'fare'='THOROUGHFARE'

'takes' acts as a link.

Can you help me to learn more?

(Other definitions for thoroughfare that I've seen before include "Road or path" , "Public way or street" , "highway" , "Public road" , "Access - road" .)

I've seen this clue in The Times.
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