Would an ice-cap cool him down? (7)
I believe the answer is:
hothead
'would an ice-cap cool him down?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'an ice-cap cool him down?' is the wordplay.
I cannot really see how this works, but
'an' could be 'a' and 'a' is found within the answer.
'him' could be 'ed' (short for Edward) and 'ed' is found within the remaining letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for hothead that I've seen before include "Quick-tempered person" , "Impetuous irresponsible person" , "maniac" , "Daredevil" , "Fiery character" .)