Could its heat melt a piece of toilet soap? (4)
I believe the answer is:
oast
'could its heat' is the definition.
I can't judge whether this defines the answer.
'melt a piece of toilet soap?' is the wordplay.
'melt' indicates anagramming the letters.
'piece' says to take the initial letters (I've seen 'pieces of' mean this).
The initial letters of 'of toilet soap' is 'ots'.
'a'+'ots'='aots'
'aots' with letters rearranged gives 'OAST'.
Can you help me to learn more?
(Other definitions for oast that I've seen before include "Oven for hops" , "Hop-kiln" , "Hop drying kiln" , "Kiln for drying hops or malt" , "Hop-drier" .)