Missing Spain is relative -- I'll go to Portugal for free (6)
I believe the answer is:
unclip
'free' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for unclip that I've seen before include "Release from a restraint" , "Release from fastener" .)