Pernod drunk hot and cool? It makes you feel good (9)
I believe the answer is:
endorphin
'feel good' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'pernod drunk hot and cool?' is the wordplay.
'drunk' indicates anagramming the letters.
'hot' becomes 'h' (abbreviation, eg on taps).
'and' is a charade indicator (letters next to each other).
'cool?' becomes 'in' ('in' can mean fashionable or cool).
'pernod' is an anagram of 'endorp'.
'endorp'+'h'+'in'='ENDORPHIN'
'it makes you' acts as a link.
Can you help me to learn more?
(Other definitions for endorphin that I've seen before include "Opiate-like substance produced in the brain" , "Neurochemical with analgesic properties - dinner hop (anag)" , "painkiller" , "Hormone in the brain with an analgesic effect" .)