Come, show up (6)
I believe the answer is:
arrive
This clue is a double definition.
'come' is the first definition.
(I know that come can be written as arrive)
'show up' is the second definition.
(I've seen this before)
(Other definitions for arrive that I've seen before include "Drop in" , "Reach intended destination" , "Reach a place" , "Come to a destination" , "Make it" .)