Enter data (5)
'enter data' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for input that I've seen before include "Feed data into a computer" , "Resource" , "data-feed" , "Person's contribution (to activity); electrical signal" , "Simple, without artifice" .)
'enter data' is the definition.
(I've seen this before)
This is all the clue.
(Another definition for key in that I've seen is " Enter data".)