Prime Minister aced Opposition. Let's pack up and leave! (6)
I believe the answer is:
decamp
'pack up and leave' is the definition.
(I've seen this in another clue)
'prime minister aced opposition let's' is the wordplay.
I cannot quite see how this works, but
an anagram of 'aced' is 'deca' which is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for decamp that I've seen before include "escape" , "Bolt" , "Fold up tent and depart" , "Run away (from responsibility)" , "beat it" .)