Crossword Genius

Visitor to arrive on time (5)

Ross

I believe the answer is:

comet

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'visitor' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'arrive on time' is the wordplay.
'arrive' becomes 'come' (synonyms).
'on' is a charade indicator (letters next to each other).
'time' becomes 't' (abbreviation).
'come'+'t'='COMET'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for comet that I've seen before include "Frozen body" , "Omen supposedly" , "one of Santa's reindeer" , "body found in space" , "Heavenly body with a fiery tail" .)

I've seen this clue in The Hindu.
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