Dictator's refusal to sound like a nag (5)
I believe the answer is:
neigh
'sound like a nag' is the definition.
I can't judge whether this defines the answer.
'dictator's refusal' is the wordplay.
'dictator's' indicates a 'sounds like' (homophone) clue (as somebody dictating would pronounce the word).
'refusal' becomes 'nay' (archaic word for 'no').
'nay' is a homophone of 'NEIGH'.
'to' is the link.
Can you help me to learn more?
(Other definitions for neigh that I've seen before include "The noise of a bay" , "Cry coming from mount" , "Horse's cry" , "Whicker" , "Mare's cry, e.g." .)