Contact-trace? (5)
I believe the answer is:
touch
This clue is a double definition.
'contact' is the first definition.
(I know that contact can be written as touch)
'trace?' is the second definition.
(I know that ghost can be written as touch)
(Other definitions for touch that I've seen before include "spot" , "Side beyond playing area" , "Graze" , "off pitch" , "kiss" .)