Computer key to reducing dysentery (5)

I believe the answer is:

enter

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

'computer key' is the definition.
(I know that Enter is a computer key)

'reducing dysentery' is the wordplay.
'ENTER' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.

'to' is the link.

Can you help me to learn more?

(Other definitions for enter that I've seen before include "Move into" , "Pierce" , "put in for a race" , "Come/go in" , "Get in" .)

I've seen this clue in the Sydney Morning Herald.

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