Complete set of countries pressing to drop borders (5)
I believe the answer is:
uncut
'complete' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for uncut that I've seen before include "Without abridgement" , "Not edited" , "State of raw unprocessed diamond" , "State of raw diamond before processing" , "Not censored" .)