PC key above Shift (5)
I believe the answer is:
enter
'pc key above shift' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for enter that I've seen before include "Register (as a competitor)" , "Treen (anag.)" , "Record (in a log)" , "Come/go in" , "Gain access to" .)