What may contain beer — Courage, perhaps (6)
I believe the answer is:
bottle
This clue is a double definition.
'what may contain beer' is the first definition.
(beer comes in bottles)
'courage perhaps' is the second definition.
(bottle can mean courage or bravery)
(Other definitions for bottle that I've seen before include "Glass or plastic vessel" , "It keeps drink" , "cool" , "Device used by beer drinkers" , "beer found in this?" .)