A dramatic reminder (8)
I believe the answer is:
prompter
'a dramatic reminder' is the definition.
'prompter' can be an answer for 'reminder' (I've seen this before). I am not certain of the 'a dramatic' bit.
'reminder' is the wordplay.
I cannot really see how this works, but
'reminder' could be 'prompt' (I've seen this before) and 'prompt' is present in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for prompter that I've seen before include "Supplier of lines in the theatre" , "even more timely" , "more quickly?" , "Theatre worker" , "to give help on the line?" .)