Crossword Genius

Straight line, we hear, in Cornish city (5)

Ross

I believe the answer is:

truro

'cornish city' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for truro that I've seen before include "English city" , "Cornish market town" , "City of Cornwall" , "Cornish county town" , "One slain by Cain" .)

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