New aide's dramatic remark (5)
I believe the answer is:
aside
'dramatic remark' is the definition.
'aside' can be an answer for 'remark' (I have seen 'Confidential remark' mean 'aside' so perhaps 'remark' could also mean 'aside'). I am not sure about the 'dramatic' bit.
'new aide's' is the wordplay.
'new' indicates anagramming the letters.
'aides' anagrammed gives 'ASIDE'.
Can you help me to learn more?
(Other definitions for aside that I've seen before include "In reserve -- confidential remark" , "Where one's taken for intimacy" , "Quiet words spoken" , "Words spoken apart in an undertone" , "Actor's covert line" .)