Piece of news one encountered on rising (4)
I believe the answer is:
item
'piece of news' is the definition.
(I've seen this before)
'one encountered on rising' is the wordplay.
'one' becomes 'i' (Roman numeral).
'encountered' becomes 'met' ('meet' can be a synonym of 'encounter').
'on' is a charade indicator (letters next to each other).
'rising' shows that the letters should be reversed in order (going up in a down clue).
'i' put after 'met' is 'meti'.
'meti' backwards is 'ITEM'.
(Other definitions for item that I've seen before include "Individual unit in a list" , "newspaper article" , "One thing among many" , "Entry (in an account)" , "One unit on a list" .)