Scold furiously, but not irate, surprisingly (4,4)
I believe the answer is:
tear into
'scold furiously' is the definition.
(I've seen this before)
'not irate surprisingly' is the wordplay.
'surprisingly' indicates anagramming the letters (a surprising ordering of the letters).
'not'+'irate'='notirate'
'notirate' is an anagram of 'TEAR INTO'.
'but' acts as a link.
(Other definitions for tear into that I've seen before include "handbag" , "Scold furiously" , "Attack verbally" .)