'Express again?', others scoffed (7)
I believe the answer is:
restate
'express again?' is the definition.
('state' is an answer for 'express' so perhaps 'restate' is OK for 'express again')
'others scoffed' is the wordplay.
'others' becomes 'rest' (I've seen this before).
'scoffed' becomes 'ate' ('to scoff' is to eat).
'rest'+'ate'='RESTATE'
(Other definitions for restate that I've seen before include "say, in other words" , "Go over" , "say, a different way" , "Once more affirm" .)