Turn the top of Erdinger bottle (5)
I believe the answer is:
spine
'bottle' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'turn the top of erdinger' is the wordplay.
'turn' becomes 'spin' (spin is a kind of turn).
'the top of' indicates taking the first letters.
The initial letter of 'erdinger' is 'e'.
'spin'+'e'='SPINE'
Can you help me to learn more?
(Other definitions for spine that I've seen before include "Vertebral column" , "Backbone" , "Line of vertebrae" , "Series of vertebrae" , "Strength of character" .)