Tell again (7)
I believe the answer is:
restate
'tell again' is the definition.
('state' can be a synonym for 'tell' so perhaps 'restate' is OK for 'tell again')
This is all the clue.
(Other definitions for restate that I've seen before include "say, in other words" , "Once more affirm" , "say, a different way" , "Go over" .)