Drink makes me perform with a cool head (5)
I believe the answer is:
medoc
'drink' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'me perform with a cool head' is the wordplay.
'perform' becomes 'do' (both can mean complete an action).
'with' is a charade indicator (letters next to each other).
'head' suggests taking the first letters.
The first letter of 'cool' is 'c'.
'me'+'do'+'c'='MEDOC'
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for medoc that I've seen before include "Type of wine" , "Red wine from southwest France" , "that's regularly drunk?" , "French intoxicant" , "Wine-growing area" .)