Talk about Daniel ends in dismal manner (5)
I believe the answer is:
sadly
'talk about daniel ends in dismal manner' is the definition.
I can't judge whether this definition defines the answer.
'talk about daniel ends' is the wordplay.
'talk' becomes 'say' (I've seen this in another clue).
'about' means one lot of letters goes inside another.
'ends' suggests removing the centre.
'daniel' with its centre removed is 'dl'.
'say' enclosing 'dl' is 'SADLY'.
Can you help me to learn more?
(Other definitions for sadly that I've seen before include "With sorrow" , "Regrettably" , "Lamentably, unfortunately" , "Unhappily" , "Alas" .)