Calls from UN medics to drop restrictions at last (6)
I believe the answer is:
whoops
'calls' is the definition.
(I know this)
'un medics to drop restrictions at last' is the wordplay.
'un medics' becomes 'who' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'at last' says to take the final letters.
The last letters of 'to drop restrictions' are 'ops'.
'who'+'ops'='WHOOPS'
'from' is the link.
Can you help me to learn more?
(Other definitions for whoops that I've seen before include "Loud cries of excitement" , "Worrying cry" , "Oh dear! That was a mistake!" , "Something said after minor accident or mistake" , "Yikes, I've dropped something!" .)