Stands on one-leg in ring of fire. (8)
I believe the answer is:
flamingo
'stands' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'on one-leg in ring of fire' is the wordplay.
'on' says to put letters next to each other.
'one' becomes 'o' (I've seen this in other clues).
'leg in ring of fire' becomes 'flaming' (I can't explain this - if you can you should give a lot more credence to this answer).
'o' after 'flaming' is 'FLAMINGO'.
Can you help me to learn more?
(Other definitions for flamingo that I've seen before include "Pink flier" , "Pretty bird" , "colourful bird" , "Long-legged wader" , "Wading bird with pink and red plumage" .)