This volcano gives out when hot (3)
I believe the answer is:
ash
'this volcano gives' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'when hot' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'hot' becomes 'h' (abbreviation, eg on taps).
'as'+'h'='ASH'
'out' acts as a link.
Can you help me to learn more?
(Other definitions for ash that I've seen before include "Residue after burning" , "End of fire" , "Wooden" , "Tree; cinders" , "Common tree" .)