Prisoner, more stupid, gets some refrigeration (9)
I believe the answer is:
condenser
'some refrigeration' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'prisoner more stupid' is the wordplay.
'prisoner' becomes 'con' (abbreviation for 'convict').
'more stupid' becomes 'denser' ('dense' can be similar in meaning to 'stupid').
'con'+'denser'='CONDENSER'
'gets' acts as a link.
Can you help me to learn more?
(Other definitions for condenser that I've seen before include "type of lens" , "One may have charge" , "Another name for a capacitor" , "cooler?" , "contracts" .)