Crossword Genius

Indicate by your expression when you enter (8)

Ross

I believe the answer is:

register

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'indicate' is the definition.
(registering is a kind of indicating)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for register that I've seen before include "Index" , "Show" , "Official list or record" , "(Put one's name down on) list" , "To express" .)

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