Henry the Second in control? That has a good ring to it! (4)
I believe the answer is:
halo
'henry the second in control? that has a good ring to it' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'henry the second in control? that has' is the wordplay.
'henry' becomes 'hal'.
'the second in control?' becomes 'o' (2nd letter of 'control?').
'that has' means one lot of letters go next to another.
'hal'+'o'='HALO'
Can you help me to learn more?
(Other definitions for halo that I've seen before include "Ring of saintliness" , "Angel's head-light" , "Saint's overhead ring of light" , "Ring (around sun or moon)" , "overhead lighting?" .)