Run on the spot! (4)
I believe the answer is:
idle
'run on the spot' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Maybe you can see a link between them that I don't see?
This is the entire clue.
Can you help me to learn more?
(Other definitions for idle that I've seen before include "lndolent" , "Not busy" , "Futile" , "Circus entertainer" , "jobless" .)