One claiming to predict future meeting editor? Get very angry (3,3)
I believe the answer is:
see red
'get very angry' is the definition.
(to see red is to get angry)
'one claiming to predict future meeting editor?' is the wordplay.
'one claiming to predict future' becomes 'seer' (a seer predicts the future).
'meeting' says to put letters next to each other.
'editor?' becomes 'ed' (abbreviation).
'seer'+'ed'='SEE RED'
(Other definitions for see red that I've seen before include "Get furious" , "Lose temper like angry bull" , "Lose temper like raging bull" , "Lose temper as bull might" , "get angry" .)