Opening found by journalist opened wide (5)
I believe the answer is:
gaped
'opened wide' is the definition.
(I've seen this in another clue)
'opening found by journalist' is the wordplay.
'opening' becomes 'gap' (gap is a kind of opening).
'found by' is a charade indicator (letters next to each other).
'journalist' becomes 'ed' (short for editor).
'gap'+'ed'='GAPED'
(Other definitions for gaped that I've seen before include "Was yawning" , "Opened mouth wide" , "shown astonishment" , "Looked stunned" , "Stared open-mouthed - yawned" .)