Reproachful sound from that little old king (3)
I believe the answer is:
tut
This clue could be a double definition.
'reproachful sound from that little' is the first definition.
'tut' can be an answer for 'reproachful sound' (I've seen this in another clue). I am not certain of the rest of the definition.
'old king' is the second definition.
(King Tut)
Can you help me to learn more?
(Other definitions for tut that I've seen before include "Exclamation of rebuke, usually doubled" , "Sound of mild disapproval" , "Disapproving noise" , "Express impatience" , "former ruler, in brief" .)