Neat change of height (4)
I believe the answer is:
etna
'height' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'neat change' is the wordplay.
'change' indicates anagramming the letters.
'neat' with letters rearranged gives 'ETNA'.
'of' is the link.
Can you help me to learn more?
(Other definitions for etna that I've seen before include "Volcanic mount in Sicily" , "Neat volcano overturned" , "high peak" , "Heating vessel" , "Explosive type" .)