Reported a calm fragment (5)
I believe the answer is:
piece
'fragment' is the definition.
(I've seen this in another clue)
'reported a calm' is the wordplay.
'reported' indicates a 'sounds like' (homophone) clue.
'a calm' becomes 'peace' (peaceful situation).
'peace' is a homophone of 'PIECE'.
(Other definitions for piece that I've seen before include "Morsel" , "Queen on board, perhaps" , "Fragment" , "Component; portion" , "constituent" .)