1 relative briefly holding licence to kill (6)
I believe the answer is:
uncool
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for uncool that I've seen before include "hot?" , "Old-fashioned" , "Not fashionable (colloq.)" , "Not in fashion or with it" , "Not with it (but warm?)" .)