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Bright visitors arrive by backstreet (6)

Ross

I believe the answer is:

comets

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

'bright visitors' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

'arrive by backstreet' is the wordplay.
'arrive' becomes 'come' (coming is a kind of arriving).
'by' says to put letters next to each other.
'backstreet' becomes 'ts' ('st' backwards).
'come'+'ts'='COMETS'

Can you help me to learn more?

(Other definitions for comets that I've seen before include "Space travellers" , "Heavenly bodies with tails" , "Small extraterrestrial bodies" .)

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