I will need one input -- you will need two more (9)

I believe the answer is:

keystroke

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

'i' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for keystroke that I've seen before include "Single operation on a typewriter" , "Single depression of a character on a computer terminal" , "One tap" , "Single motion during typing" , "One character typed" .)

I've seen this clue in The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.