On beer and pot, let loose — it’s what drinker needs (6-6)
I believe the answer is:
bottle-opener
'what drinker needs' is the definition.
I can't judge whether this defines the answer.
'on beer and pot let loose' is the wordplay.
'and' means one lot of letters go next to another.
'loose' is an anagram indicator (letters are loosened from their original positions).
'on'+'beer'+'pot'+'let'='onbeerpotlet'
'onbeerpotlet' anagrammed gives 'BOTTLE-OPENER'.
'it's' is the link.
Can you help me to learn more?
(Another definition for bottle-opener that I've seen is " Device for removing caps and corks".)