Insult awfully pleasant chief (4,2,3,4)
I believe the answer is:
slap in the face
'insult' is the definition.
(I've seen this before)
'awfully pleasant chief' is the wordplay.
'awfully' indicates an anagram.
'pleasant'+'chief'='pleasantchief'
'pleasantchief' with letters rearranged gives 'SLAP IN THE FACE'.
(Other definitions for slap in the face that I've seen before include "Unexpected affront" , "the result of stupidly eating pancake?" , "Unexpected rejection" , "Insult" .)