Crossword Genius

How do celebrities appear in this? (5)

Ross

I believe the answer is:

hello

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

'how do' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for hello that I've seen before include "Meeting greeting" , "Hi, howdy" , "Conversation starter" , "Publication" , "royals dominate its pages?" .)

I've seen this clue in The Sunday Times and The Times.
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